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Pictures of fossils, fossil hunting trips, fossil sites and photographs relating to fossil hunting and fossil finds.

13 08, 2022

A Very Strange Armoured Dinosaur from South America

By | August 13th, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Researchers have announced the discovery of a new species of Late Cretaceous armoured dinosaur from fragmentary fossils found in North Patagonia, (Río Negro Province, Argentina). It may represent an entirely new and previously unknown branch of the armoured dinosaur family tree from South America (Gondwana). Named Jakapil kaniukura (pronounced Jack-a-pil can-nee-ook-your-rah), it is the first definitive thyreophoran species from the Patagonia of Argentina and it might have been a biped with short, stumpy arms reminiscent of the abelisaurid theropod dinosaurs.

Jakapil kaniukura life reconstruction (thyreophoran).
Life reconstruction of Jakapil kaniukura, the first thyreophoran dinosaur of its kind from Argentina and South America. Picture credit: Mauricio Álvarez and Gabriel Díaz Yanten (paleogdy).

Fossils from the “La Buitrera Paleontological Area” (LBPA)

Writing in the academic journal “Scientific Reports”, researchers from the Universidad Maimónides (Buenos Aires, Argentina) in collaboration with a colleague from the Universidad del País Vasco/Euskal Herriko Unibertsitatea (Bilbao, Spain), report the discovery of a fragmentary, disarticulated skeleton representing a sub-adult animal, from the upper beds of the Candeleros Formation (early Late Cretaceous 94-97 million years ago). The sandstone exposures represent aeolian (wind borne) sand dunes indicating an arid to semi-arid palaeoenvironment in what is now termed the “La Buitrera Paleontological Area” (LBPA). The holotype (MPCA-PV-371), consists of skull elements including bones from the jaw, rib fragments, bones from the shoulders, two partial upper arm bones (humeri), a possible partial right ulna and other assorted fragmentary limb bones. Fifteen partial teeth were also recovered along with numerous osteoderms (dermal armour).

Jakapil kaniukura skeletal reconstruction.
Skeletal reconstruction of Jakapil kaniukura with known fossil material in white. Fragmentary fossil material pictured, note scale bar = 40 cm. Picture credit: Riguetti et al.

The sub-adult animal is estimated to have had a body length of less than 1.5 metres, perhaps weighing around 4.5 to 7 kilograms.

Commenting on the significance of this fossil discovery, lead author of the paper Facundo Riguetti (Universidad Maimónides), stated:

“Our finding is important for several reasons. On the one hand, Jakapil expands the fossil record known in the region and allows us to know a little better the prehistoric ecosystem of our land, and specifically of the ancient Kokorkom desert, today northern Patagonia.”

Jakapil kaniukura excavation site.
First author of the scientific paper, Facundo Riguetti at the dig site. Picture credit: Sebastián Apesteguía.

The PhD student went onto add:

“Moreover, this new species represents a lineage of thyreophoran dinosaurs previously unknown in South America. The Thyreophora originated about two hundred million years ago and evolved rapidly into several species distributed throughout the world. However, of these early thyreophorans, the lineage represented by Jakapil was the only one that persisted until at least a hundred million years ago.”

A Survivor from an Ancient Armoured Dinosaur Line

Phylogenetic analysis recovers Jakapil kaniukura either as a basal member of the Thyreophora or a stem ankylosaur, closely related to Scelidosaurus, fossils of which are associated with the Lower Jurassic Charmouth Mudstone Formation of Dorset, England. Its discovery suggests that early thyreophorans had a much broader geographic distribution than previously thought and that an ancient lineage persisted into the early Late Cretaceous.

One of the dermal scutes associated with the Jakapil kaniukura fossil specimen.
Fossilised fragment of dermal bones that act as armour for the plant-eating dinosaur. Picture credit: Facundo Riguetti.

A Bipedal Armoured Dinosaur

Evolutionary trends observed in armoured dinosaurs suggest a transition between small, cursorial, light-weight species to much larger, heavily armoured quadrupedal forms epitomised by the likes of Stegosaurus in the Late Jurassic and Ankylosaurus and Edmontonia in the Late Cretaceous. The relative dimensions of the forelimb and hind limb bear a greater resemblance to those of bipedal theropods and basal ornithischian dinosaurs than they do to members of the Thyreophora.

The reduced nature of the upper arm, indicated by the fragmentary humeri resembles the arm bones of abelisaurids – famous for their tiny, almost vestigial front limbs.

Life reconstruction Jakapil kaniukura.
A life reconstruction of the newly described Cretaceous thyreophoran Jakapil kaniukura. Picture credit: Daniel Boh with additional annotation by Everything Dinosaur.

Etymology

The genus name is from the northern Tehuelchean language meaning “shield bearer”, whilst the species name is derived from the Mapudungun language for “crest” (kaniu) and “stone” (kura) which references the diagnostic bony crest on the lower jaw.

Co-author of the scientific paper Sebastián Apesteguía at the Jakapil dig site.
Co-author of the scientific paper Sebastián Apesteguía at the Jakapil dig site. Picture credit: Pablo Destito.

The researchers, including co-author Sebastián Apesteguía (Universidad Maimónides) speculate that Jakapil, if it was a biped, resembled Scutellosaurus, which is known from the Early Jurassic of Arizona. However, they caution against defining this little armoured dinosaur as bipedal. They observe that it still retains some anatomical characteristics associated with a quadrupedal stance and they comment that more complete limb bones are required to make a more accurate assessment of its locomotion.

Everything Dinosaur acknowledges the assistance of a media release from the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) in the compilation of this article.

The scientific paper: “A new Cretaceous thyreophoran from Patagonia supports a South American lineage of armoured dinosaurs” by Facundo J. Riguetti, Sebastián Apesteguía and Xabier Pereda-Suberbiola published in Scientific Reports.

29 07, 2022

Finding Fossil Fish Down on the Farm

By | July 29th, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Geology, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

A farmer’s field in rural Gloucestershire (England), has provided palaeontologists with a remarkable glimpse into an Early Jurassic marine ecosystem.

Underneath a grassy bank, normally grazed by cattle at Court Farm, Kings Stanley near Stroud, lies an exceptional fossil site that contains the remains of fish, ammonites, squid, marine reptiles and other creatures, with many of the specimens preserved in three dimensions.

Fossil fish skull
A three-dimensional fish skull (Pachycormus spp.) from a limestone concretion found at Court Farm. Note the small ammonite located in association with the skull. Picture credit: Dean Lomax.

A Toarcian Ecosystem

The clays and hard limestone nodules, many of which contain fossils, were deposited around 183 million years ago (Toarcian stage of the Early Jurassic).

The site was discovered by Sally and Neville Hollingworth, avid fossil collectors who recently uncovered the remains of mammoths in the nearby Cotswold Water Park which was featured in the BBC One documentary “Attenborough and the Mammoth Graveyard” in 2021.

Fossil Hunters Neville and Sally Hollingworth
Neville and Sally Hollingworth at the dig site. Picture credit: Nigel Larkin.

Commenting on the significance of this location, enthusiastic fossil hunters Neville and Sally stated:

“These fossils come from the Early Jurassic, specifically a time called the Toarcian. The clay layers exposed at this site near Stroud have yielded a significant number of well-preserved marine vertebrate fossils that are comparable to the famous and exquisitely preserved similar fauna of the Strawberry Bank Lagerstätte from Ilminster, Somerset – a prehistoric site of exceptional fossil preservation. Excavations at Kings Stanley over the last week have revealed a rich source of fossil material, particularly from a rare layer of rock that has not been exposed since the late 19th Century.”

Early Jurassic Fossil Fish
A stunning Early Jurassic Fossil fish from the dig site. Picture credit: Dean Lomax.

Limestone Concretions

A team of eight scientists spent a total of four days working to clear an area of the bank approximately eighty metres in length. An excavator proved invaluable, but the field team still had to endure record breaking temperatures as they laboured to find and crack open three-dimensionally preserved limestone concretions, many of which contained fossils.

Team members working at the Court Farm dig site.
Field team members busy examining and splitting limestone concretions checking for fossils. Picture credit: Nigel Larkin.

Each specimen was carefully logged onto a database and approximately 200 kilograms of clay from around the concretions was also collected and carefully sieved using a state-of-the-art sediment processing machine to help locate microvertebrate fossils such as fish teeth and small bones.

Sediment processing machine
The sediment processing machine used to help retrieve small fossils from the Lower Jurassic strata exposed at Court Farm (Gloucestershire). Note the novel use of two water troughs. Picture credit: Dr David Ward.

Fossils Donated to Local Museum

Many of the fossils found at the site will be donated to the palaeontology collection of a local museum (The Museum in the Park, Stratford Park, Stroud).

Team member and world-renowned, palaeontological conservator Nigel Larkin (Visiting Research Fellow at Reading University) commented:

“Give a person a fish and you feed them for a day. Give a palaeontologist a fossil fish and they will tell you the species, the age of the rock, the climate of the time when the fish was alive plus the water depth and salinity and plenty of other information. This site – already an interesting farm in a beautiful setting – is one big outdoor classroom and the lessons now include geology, palaeontology, evolution and climate change. They tell farmers to diversify but this goes one step beyond!”

Exceptional Fossil Fish Finds

Some of the best finds include fossil fish, so well-preserved that details of the scales, fins and even their eyeballs can be made out. One of the most impressive discoveries was a three-dimensionally preserved fish skull, a Pachycormus, (see first image), a genus of ray-finned fish known from the Toarcian of Europe.

The lack of any signs of scavenging of the corpses and the absence of encrusting animals or burrows in the sediment suggest that the fauna which was frozen in time under a farmer’s field was rapidly buried.

A fossil fish (slab and counter slab)
A limestone nodule spilt open reveals the fossilised remains of an Early Jurassic fish (slab and counter slab). Picture credit: Dean Lomax.

The layered concretions around the organisms formed relatively early before the sediments were compacted, as the original sediment layering is preserved. These concretions prevented further compaction, compression and distortion from the overlying sediments during burial and thus preserved the fossils as three-dimensional time capsules.

Dr Dean Lomax, a palaeontologist and a Visiting Scientist at the University of Manchester, who recently led the excavation of the Rutland ichthyosaur that also dates to the Toarcian geological age, was part of the team he explained:

“The site is quite remarkable, with numerous beautifully preserved fossils of ancient animals that once lived in a Jurassic sea that covered this part of the UK during the Jurassic. Inland locations with fossils like this are rare in the UK. The fossils we have collected will surely form the basis of research projects for years to come.”

Court Farm dig team.
The dig team take a well-earned break, time for a group photograph. Picture credit: Nigel Larkin.

Landowner, Adam Knight, who has seen part of his farm temporarily converted into a real life “Jurassic Park” added:

“I’m delighted that after the initial work that Sally and Nev did over three years ago we now have a full-scale dig on the farm involving a range of fossil experts from The Natural History Museum, University of Manchester, University of Reading and The Open University. On Friday we were also joined by Emily Baldry on a day’s work experience before she goes to university to study palaeontology – it’s wonderful to see her enthusiasm for her chosen profession. It has been a real pleasure to host the dig and I’m excited to see the results of what has been found.”

Important Microvertebrates and Fossil Insects

Dr David Ward (research scientist at the Natural History Museum, London), outlined his contribution to the fieldwork explaining that his role was to collect evidence of all the small creatures that lived alongside the larger vertebrates and invertebrates in the ancient marine ecosystem.

The silty clay found in association with the limestone concretions was carefully washed and pushed through a fine sieve. Dr Ward’s wife Alison played a vital role in the collection process, and she added:

“My specialism is surface picking. This involves finding areas where fossils, particularly small bones and teeth, are naturally concentrated on the surface. Here, once I had collected them, I dug up the surrounding clay and fed it into David’s clay washing machine. The result is a fine concentrate of tiny fish bones and shells which we sort under a microscope.”

For Open University PhD student Emily Swaby, this fossil site has very special significance. Her PhD research is focused on how insects were affected by dramatic environmental changes that took place during the Toarcian. Fossil insects are extremely rare and although the Court Farm site represents marine deposition, insect fossils are known from such locations.

Emily commented:

“Further research at this site and surrounding Gloucestershire localities might help us to work out the abundance and diversity of insects during this time and help us to understand how this environmental change influenced insects.”

A view of the Court Farm dig site
A view of the exposed strata at the Court Farm dig site. Picture credit: Steve Dey.

Everything Dinosaur acknowledges the assistance of a media release from the University of Manchester and additional information supplied by Dr Dean Lomax in the compilation of this article.

27 07, 2022

Plesiosaurs Swam Alongside Spinosaurus

By | July 27th, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Plesiosaur fossils found in strata associated with a 100-million-year-old river system prove that some plesiosaurs, traditionally thought to be marine animals, may have lived in freshwater. These long-necked, piscivores co-existed with the giant dinosaur Spinosaurus (S. aegyptiacus).

Spinosaurus and Plesiosaurus encounter.
A plesiosaur in freshwater encounters a Spinosaurus. Artwork by Andrey Atuchin. Picture credit: University of Bath.

Freshwater Plesiosaurs

Scientists from the University of Bath and University of Portsmouth in the UK, and Université Hassan II (Morocco), have reported evidence small plesiosaurs from Kem Kem Group deposits in Morocco.

The fossils include bones and teeth from three-metre-long adults and an arm bone (humerus) from a 1.5- metre-long juvenile. They hint that these creatures routinely lived and fed in freshwater, alongside frogs, crocodiles, turtles, fish, and the huge aquatic dinosaur Spinosaurus.

Plesiosaur humerus
The humerus (upper arm bone) from a juvenile plesiosaur. Picture credit: University of Bath.

When is a “Marine Reptile” a Marine Reptile?

The Plesiosauria clade was a long-lived and widely distributed group of marine reptiles. Most fossils, which date from the Upper Triassic to the end of the Cretaceous (Maastrichtian faunal stage), are associated with marine deposits, but a few specimens have been found in strata associated with brackish and freshwater environments. The researchers report plesiosaurs from river deposits of the Kem Kem Group. The numerous shed teeth show heavy wear similar to that observed in in the teeth of coeval spinosaurids. Contemporary plesiosaur fossils from the Bahariya Formation of Egypt have been identified as examples of the Polycotylidae plesiosaur family. The Kem Kem fossils probably represent leptocleidid plesiosaurs. Most Leptocleididae fossils come from shallow nearshore, brackish or freshwater palaeoenvironments suggesting that these small-bodied plesiosaurs were adapted to shallow, low-salinity environments.

A plesiosaur tooth
A single plesiosaur tooth from the Kem Kem Group. Numerous teeth have been found indicating that these plesiosaurs were frequent visitors to freshwater habitats and perhaps were permanent residents. Picture credit: University of Bath.

As the fossil plesiosaur teeth show the same signs of wear as the teeth of Spinosaurus, the researchers imply that the plesiosaurs were eating the same food – chipping their teeth on the armoured fish that lived in the river. This indicates that they spent a lot of time in the river, rather than being occasional visitors.

As other types of Mesozoic marine reptile (mosasaurids and the crocodile-like teleosaurids), are thought to have inhabited (at least some of the time), freshwater environments, this suggests that so-called “marine reptiles” may have thrived in non-marine habitats.

Co-author of the scientific paper, Dr Nick Longrich (University of Bath Milner Centre for Evolution), commented:

“It’s scrappy stuff, but isolated bones actually tell us a lot about ancient ecosystems and animals in them. They’re so much more common than skeletons, they give you more information to work with. The bones and teeth were found scattered and in different localities, not as a skeleton. So, each bone and each tooth is a different animal. We have over a dozen animals in this collection.”

Diverse and Varied Kem Kem Group Freshwater Fauna

While extant marine mammals like whales and dolphins wander up rivers, either to feed or because they are lost, the number of plesiosaur fossils in the river deposits suggest that is unlikely. The team identified cervical, dorsal and caudal vertebrae, lots of teeth and the humerus from a juvenile. The researchers postulate that the plesiosaurs were able to tolerate fresh and salt water, like some whales, such as the beluga whale (Delphinapterus leucas).

Co-author Dr Samir Zouhri said:

“This is another sensational discovery that adds to the many discoveries we have made in the Kem Kem over the past fifteen years of work in this region of Morocco. Kem Kem was truly an incredible biodiversity hotspot in the Cretaceous.”

Kem Kem Group fauna.
Silhouettes showing examples of Kem Kem Group freshwater fauna. Silhouettes show approximate size, the size and the diversity of predators suggests a rich ecosystem. Picture credit: University of Bath.

Plesiosaurs – Freshwater Incursions

The researchers compiled a list of all the geological formations that have shown evidence for the presence of members of the Plesiosauria clade in brackish or freshwater. Having collated this information, they re-examined the data identifying the different types of plesiosaur associated with the deposit.

As a result, a map documenting the incidences of freshwater incursions by different plesiosaur types was produced.

Plesiosaur distribution map
Plesiosaur distribution map. Evidence for freshwater/estuarine incursion by different types of plesiosaur. Picture credit: University of Bath.

For the key to the geological formations see the end of this article.

Co-author David Martill (University of Portsmouth) exclaimed:

“What amazes me is that the ancient Moroccan river contained so many carnivores all living alongside each other. This was no place to go for a swim.”

Key to the Geological Formations Featured in the Plesiosaur Map

Geographic distribution of non-marine Plesiosauria Formations: 1, Dinosaur Park Formation (Campanian); (2), Horseshoe Canyon Formation (Campanian – Maastrichtian); 3, Isachsen Fm. (Late Aptian); 4, Strand Fiord Formation (Turonian – Coniacian); 5, Great Estuarine Group (Bathonian); 6, La Colonia Formation (Upper Campanian – Lower Maastrichtian); 7, Wadhurst Clay Formation (Valanginian); 8, Tunbridge Wells Sands Formation (Upper Valanginian); 9, Wessex Formation (Barremian); 10, Upper Weald Clay Formation (Barremian); 11, Vectis Formation (Barremian – Aptian); 12, Obernkirchen Sandstone (Late Berriasian);
13, Bükerberg Formation (Berriasian); 14, Kem Kem beds (Cenomanian – Albian?); 15, Chenini Formation (Albian); 16, Bahariya Formation (Cenomanian), 17, Sunday River Formation (Valanginian); 18, Lianmugin Formation (Upper Aptian); 19, Xinhe Formation (Middle Jurassic); 20, Ziliujing Formation (Toarcian); 21, Xintiangou Formation (Middle Jurassic), 22, Xiashaximiao Formation (Middle Jurassic); 23, Shezi Formation (Upper Triassic); 24, Razorback Beds (Sinemurian); 25, Evergreen Formation (Pliensbachian – Toarcian); 26, Griman Creek Formation (Albian); 27, Eumeralla Formation (Aptian) 28; Wonthaggi Formation (Valanginian – Aptian), 29 Eumeralla Formation (Upper Aptian – Lower Albian). Note that some formations contain more than one occurrence.

Everything Dinosaur acknowledges the assistance of a media release from the University of Bath in the compilation of this article.

The scientific paper: “Plesiosaurs from the fluvial Kem Kem Group (mid-Cretaceous) of eastern Morocco and a review of non-marine plesiosaurs” by Georgina Bunker, David M. Martill, Roy Smith, Samir Zouhri and Nick Longrich.

25 07, 2022

Earliest Known Animal Predator

By | July 25th, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Scientists have announced the discovery of what might possibly be the earliest known animal predator. The fossils discovered in Charnwood Forest (Leicester, England), are estimated to be around 560 million years old and the animal has been named Auroralumina attenboroughii in honour of Sir David Attenborough.

A life reconstruction of Auroralumina attenboroughii
A life reconstruction of Auroralumina attenboroughii superimposed on the fossil material. Picture credit: BGS @ UKRI.

Attenborough’s Dawn Lantern

As a boy, Sir David Attenborough used to collect fossils from various locations close to his Leicestershire home. However, he never went to Charnwood Forest to hunt for fossils as the rocks exposed in that area were thought to be too old to contain signs of life.

In the late 1950s, another young boy, Roger Mason found a strange frond-like impression in a rock. Researchers identified this as the fossilised remains of a bizarre organism, later named Charnia masoni, which forms part of an ancient ecosystem that existed prior to the Cambrian.

This newly described organism Auroralumina attenboroughii honours Sir David Attenborough. The first part of its name is Latin for “dawn lantern”, in recognition of its great age and the organism’s resemblance to a burning torch.

Auroralumina attenboroughii fossil.
Auroralumina attenboroughii fossil imprint preserved in the rock. Picture credit: BGS @ UKRI.

Related to Corals, Jellyfish and Anemones

The geological period known as the Ediacaran precedes the Cambrian. The Ediacaran spans an immense amount of deep time, from approximately 635 million years ago, to the beginning of the Cambrian around 540 million years ago. In some parts of the world, notably the Mistaken Point Ecological Reserve on the south-eastern coast of Newfoundland, Namibia, Guizhou Province (China), Charnwood Forest and the Flinders Ranges of South Australia, ancient sedimentary rocks preserve the remains of the oldest, complex multi-cellular organisms known to science.

Most of the Ediacaran biota bears little resemblance to fossils associated with younger Cambrian-aged strata, A. attenboroughii is an exception, the research team postulate that the fossils represent an ancestor of today’s corals, jellyfish and anemones – the Cnidaria phylum.

Auroralumina attenboroughii line drawing.
The fossil imprint of the newly described Auroralumina attenboroughii with a line drawing on the matrix to show features. Picture credit: BGS @ UKRI.

“Truly Delighted”

Naturalist, campaigner and broadcaster Sir David Attenborough stated that he was “truly delighted” with his ancient namesake.

He added:

“When I was at school in Leicester, I was an ardent fossil hunter. The rocks in which Auroralumina has now been discovered were then considered to be so ancient that they dated from long before life began on the planet. So, I never looked for fossils there.

A few years later a boy from my school found one [Roger Mason] and proved the experts wrong. He was rewarded by his name being given to his discovery. Now I have – almost – caught up with him and I am truly delighted.”

The scientific paper has been published in the journal “Nature Ecology & Evolution”. This discovery challenges perceptions as to when modern groups of animals, or their direct ancestors first evolved.

Commenting on the significance of this fossil find, one of the authors of the paper, Dr Phil Wilby (palaeontology leader at the British Geological Survey), explained:

“It’s generally held that modern animal groups like jellyfish appeared 540 million years ago in the Cambrian explosion. But this predator predates that by 20 million years. It’s the earliest creature we know of to have a skeleton. So far we’ve only found one, but it’s massively exciting to know there must be others out there, holding the key to when complex life began on Earth.”

A Geological Spring Clean

In 2007, Dr Wilby and his colleagues spent over a week carefully cleaning a 100 square metres of a rock surface exposed in the Forest. A variety of tools including pressure hoses and toothbrushes were used to spring clean deposits that were laid down at the bottom of a deep sea more than half a billion years ago.

A rubber mould of the whole surface was then taken, capturing the preserved impressions of more than a thousand fossils.

Geologists at work.
Geologists cleaning and mapping the rockface in the Charnwood Forest (Leicester, England). Picture credit: BGS @ UKRI.

One Fossil Specimen Stood Out

Co-author of the scientific paper, Dr Frankie Dunn (Oxford University Museum of Natural History), explained that one fossil impression stood out from the rest, commenting that it looked very different from the other Ediacaran fossils (Charnia masoni and Bradgatia linfordensis) preserved on the same bedding plane.

Dr Dunn commented that Auroralumina:

“Is very different to the other fossils in Charnwood Forest and around the world. Most other fossils from this time have extinct body plans and it’s not clear how they are related to living animals. This one clearly has a skeleton, with densely-packed tentacles that would have waved around in the water capturing passing food, much like corals and sea anemones do today. It’s nothing like anything else we’ve found in the fossil record at the time.”

Dr Wilby scans the fossil.
Palaeontologist Dr Phil Wilby using a 3D laser scanner to create a detailed record of the fossil. Picture credit: BGS @ UKRI.

A Lonely Fossil

Dr Dunn calls the single Auroralumina specimen a “lonely little fossil” and suggest it probably inhabited much shallower marine environments compared to rest of the Charnwood Forest biota.

She added:

“The ancient rocks in Charnwood closely resemble ones deposited in the deep ocean on the flanks of volcanic islands, much like at the base of Montserrat in the Caribbean today. All of the fossils on the cleaned rock surface were anchored to the seafloor and were knocked over in the same direction by a deluge of volcanic ash sweeping down the submerged foot of the volcano, except one, A. attenboroughii. It lies at an odd angle and has lost its base, so appears to have been swept down the slope in the deluge.”

Zircon minerals associated with the volcanic deposits permitted the researchers to accurately age the fossil based on radioactive decay measurements relating to uranium/lead ratios.

Dr Frankie Dunn said:

“The Cambrian Explosion was remarkable. It’s known as the time when the anatomy of living animal groups was fixed for the next half a billion years. Our discovery shows that the body plan of the cnidarians was fixed at least 20 million years before this, so it’s hugely exciting and raises many more questions.”

Nonagenarian Sir David Attenborough has been honoured on numerous occasions by having newly described extinct creatures named after him. However, arguably the lonely, little Auroralumina attenboroughii may represent the most significant, as it challenges existing perceptions about when animal body plans still found today, first evolved.

Everything Dinosaur acknowledges the assistance of a media release received via email on 26th July in the compilation of this article.

The scientific paper: “A crown-group cnidarian from the Ediacaran of Charnwood Forest, UK” by F. S. Dunn, C. G. Kenchington, L. A. Parry, J. W. Clark, R. S. Kendall and P. R. Wilby published in Nature Ecology & Evolution.

22 07, 2022

Australia’s First Vulture – Hiding in Plain Sight

By | July 22nd, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Today, Australia has no vultures, but in the Pleistocene Epoch it did. Researchers have reclassified fossil remains and identified Australia’s first fossil vulture. The bird, which probably stood around one metre tall, has been named Cryptogyps lacertosus. The scientific name translates as “powerful hidden vulture”, reflecting the fact that its fossils had been hiding in plain sight for more than a hundred years.

Vulture Cryptogyps compared to Aquila audax.
A silhouette of the newly described Australian vulture Cryptogyps lacertosus which lived in Australia until around 50,000 years ago. C. lacertosus (right) is compared to Aquila audax, the Wedge-tailed eagle which is Australia’s largest extant bird of prey. Wedge-tailed eagles often scavenge carcasses and are frequently observed feeding on kangaroo corpses and other animals killed in roadside collisions. The Wedge-tailed eagle is filling the ecological niche once filled by the extinct C. lacertosus. Picture credit: Ellen Mather, Flinders University Palaeontology Lab with additional annotation by Everything Dinosaur.

Fossil Vulture Hiding in Plain Sight

Researchers from Flinders University and the South Australian Museum writing in the academic journal “Zootaxa” have reassessed fossil material first described by the English ornithologist Charles Walter de Vis in 1905 and named as “Taphaetus lacertosus”. The ornithologist thought the partial humerus and fragmentary skull bones found in north-eastern South Australia represented an ancient eagle and he named the bird “powerful grave eagle”.

The scientists were able to study fossils from the Wellington Caves of New South Wales and material recovered from the Nullarbor Plain of Western Australia including a lower leg bone (tarsometatarsus), which when compared to the lower leg bones of living birds of prey, it became clear that the fossil tarsometatarsus did not support the musculature required to despatch prey.

Eagle lower leg bone compared to fossil vulture.
Comparisons of the tarsometatarsi of wedge-tailed eagle (lower right) and Cryptogyps (lower left), with position of tarsometatarsi shown in the leg (centre, based on illustration by Jollie, 1977). Picture credit: Dr Ellen Mather (Flinders University Palaeontology Lab.

Lead author of the paper, Dr Ellen Mather (Flinders University) commented:

“We compared the fossil material to birds of prey from around the world, and it became clear right away that this bird was not adapted to being a hunter, and so it was not a hawk or an eagle.”

A Phylogenetic Analysis

A phylogenetic analysis placed C. lacertosus within the subfamily Aegypiinae, making it an Old World Vulture related to extant birds found in Africa, Asia and Europe. The identification of Cryptogyps lacertosus as an Old World Vulture significantly expands the palaeogeographical range of the Old World vultures, previously unknown in Australia and indeed, there are no vultures in Australia today.

Given the megafauna that existed on the continent until very recently, giant kangaroos, flightless thunder birds, huge wombats such as Diprotodon and the enormous monitor lizard Megalania, the presence of vultures in the Pleistocene ecosystem had been predicted.

Everything Dinosaur acknowledges the assistance of a media release from Flinders University in the compilation of this article.

The scientific paper: “A new look at an old Australian raptor places “Taphaetus” lacertosus de Vis 1905 in the Old World vultures (Accipitridae: Aegypiinae)” by Ellen K. Mather, Michael S. Y. Lee and Trevor H. Worthy published in Zootaxa.

18 07, 2022

The Eotyrannus Monograph

By | July 18th, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

A new scientific paper on the Early Cretaceous tyrannosauroid Eotyrannus lengi has been published. It is confirmed as a valid genus and the phylogenetic assessment places the enigmatic Megaraptora clade within the Tyrannosauroidea superfamily.

First named and scientifically described back in 2001 (Hutt et al), Eotyrannus is helping to provide significant insights into the early evolution of tyrannosauroids as well as potentially redefining how enigmatic “megaraptors” such as Australovenator, Megaraptor and the recently described Maip macrothorax fit within the Theropoda.

Eotyrannus scale drawing.
Isle of Wight tyrannosauroid (E. lengi). The recently published monograph (Naish and Cau) supports the earlier hypothesis that this dinosaur had proportionately long arms and a rectangular snout. The holotype specimen (IWCMS: 1997.550) indicates an animal around 4.5 metres in length. However, these fossils represent a sub-adult and the fully-grown, adult size of this Early Cretaceous predator remains undetermined.

The Carnivorous Dinosaurs of the Wessex Formation

Since the first fossils of Eotyrannus were found (1997), this theropod has attracted a lot of scientific interest. It is one of numerous carnivorous dinosaurs associated with the Wessex Formation (part of the Wealden Supergroup), indeed, back in 2021 we blogged about two new members of the Baryonychinae named and described from fossil remains found on the Isle of Wight (Wessex Formation). Last month, we wrote about an even bigger predator, an as yet, unnamed spinosaurid known as the “White Rock spinosaurid”.

For the article on the recently described baryonychids Ceratosuchops inferodios and Riparovenator milnerae: Two New Spinosaurids from the Isle of Wight.

To read about the Isle of Wight “White Rock spinosaurid”: Super-sized Isle of Wight Carnivorous Dinosaur.

The newly published paper provides further information on Eotyrannus autapomorphies (characteristic traits) that help to distinguish it from the often, fragmentary remains of other theropods associated with the Wessex Formation.

Eotyrannus teeth.
Isolated Eotyrannus teeth from the Wessex Formation.

Deciphering the Fossil Evidence

Many of the fossil bones associated with the Eotyrannus genus remain entombed in their concrete-like matrix. Anatomical traits helping to define and classify this dinosaur are only beginning to emerge and there is a substantial amount of further preparation work required to permit a comprehensive analysis.

However, by combining all the new data since the formal description, the authors (Darren Naish and Andrea Cau) were able to produce a new skeletal reconstruction. The maxilla is confirmed as being quite rectangular in shape. Eotyrannus did not have the long, narrow snout (longirostrine) as seen in other early tyrannosauroids such as Dilong and Xiongguanlong from the Early Cretaceous of China. This suggests that longirostry evolved several times within the Tyrannosauroidea, perhaps in response to adaptations to permit these theropods to exploit a particular predatory niche.

Longirostry in Early Members of the Superfamily Tyrannosauroidea
Longirostry (having a long, narrow snout) in early members of the Tyrannosauroidea. Eotyrannus is confirmed as not exhibiting longirostry.

Where do the Megaraptora Fit?

The scientific paper also incorporated a revised phylogenetic analysis of Eotyrannus. No significant support was found for Eotyrannus having a close evolutionary relationship to Juratyrant (J. langhami), known from the Late Jurassic of Dorset or indeed to the Late Jurassic early tyrannosauroid Stokesosaurus (S. clevelandi) from the western United States.

Instead, it is grouped with gracile, mid-sized tyrannosauroids that represent a more derived state than proceratosaurids, stokesosaurs and Juratyrant.

If megaraptoran dinosaurs are tyrannosauroids and therefore coelurosaurs, then this challenges long-held views on Theropoda classification and suggests that after the Early Cretaceous most of the hypercarnivore niches within dinosaur dominated ecosystems were increasingly occupied by coelurosaurs. It also suggests that tyrannosauroids were much more diverse and widespread during the Cretaceous than previously thought.

Eotyrannus remains a fascinating dinosaur, a genus that has led to new insights into the evolution and radiation of the Theropoda. It offers a tantalising glimpse into the ecology represented by the Wessex Formation deposits and how a mid-sized theropod co-existed with other, larger members of the ever-widening collection of Wessex Formation meat-eating dinosaurs.

Everything Dinosaur Helping to Fund Research

The authors wanted to make their paper available to everyone. To do this they set up a GoFundMe campaign to cover publishing costs. Everything Dinosaur assisted with the funding.

A spokesperson from Everything Dinosaur stated:

“We were happy to support this excellent paper and we helped to make such studies possible. Your purchases from Everything Dinosaur genuinely help science”.

Everything Dinosaur helping to fund research.
Team members at Everything Dinosaur were happy to assist with funding a newly published paper on the early tyrannosauroid Eotyrannus lengi.

The scientific paper: “The osteology and affinities of Eotyrannus lengi, a tyrannosauroid theropod from the Wealden Supergroup of southern England” by Darren Naish and Andrea Cau published in PeerJ.

8 07, 2022

Meraxes gigas – New Giant Carcharodontosaurid from Argentina

By | July 8th, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

A new giant, Late Cretaceous predatory dinosaur has been named based on fossils found in Argentina. The dinosaur, assigned to the Carcharodontosauridae has been named Meraxes gigas and its fossilised remains represent the most complete carcharodontosaurid specimen found to date in the Southern Hemisphere.

The giant, South American predatory dinosaur Giganotosaurus which featured in the latest instalment of the “Jurassic Park/Jurassic World” movie franchise is just one of a poorly known group of theropod dinosaurs that were the apex predators in many terrestrial environments during the Cretaceous. Although, most dinosaur fans can name many carcharodontosaurids, these meat-eaters remain enigmatic and most genera have been described based on fragmentary remains. All that has changed with the publication of a scientific paper describing Meraxes gigas from the Upper Cretaceous Huincul Formation of northern Patagonia (Argentina).

Meraxes gigas life reconstruction.
A life reconstruction of the giant carcharodontosaurid from Patagonia Meraxes gigas. Picture credit: Carlos Papolio.

A Giant Predator with Short Arms

Writing in the scientific journal “Current Biology” the researchers who include Juan Canale (Universidad Nacional de Río Negro, Argentina), suggest that M. gigas was around eleven metres long and weighed around four tonnes (estimated 4.26 tonnes). The skull bones, which represent one of the most complete large theropod skulls ever found, indicate a skull length of 1.27 metres, but its arms were disproportionately small. Like other Cretaceous apex predators, the tyrannosaurs and the abelisaurids, this dinosaur had very short arms. Arms so short that they could not reach its own mouth.

Lead author Juan Canale commented:

“I’m convinced that those proportionally tiny arms had some sort of function. The skeleton shows large muscle insertions and fully developed pectoral girdles, so the arm had strong muscles. They may have used the arms for reproductive behaviour such as holding the female during mating or support themselves to stand back up after a break or a fall.”

Meraxes gigas fossil bones and skeleton.
Meraxes gigas MMCh-PV 65 and skeleton reconstruction. The white materials represent known bones. Meraxes is the most complete carcharodontosaurid yet from the Southern Hemisphere. Picture credit: Canale et al.

The fossils found in Huincul Formation exposures (late Cenomanian to Turonian) in Las Campanas Canyon some 14 miles southwest of Villa El Chocón, (Neuquén Province, Argentina), also include an almost complete right arm (j, in the image above). This limb, one of the most complete of any derived carcharodontosaurid described to date, is comparatively short and provides evidence to support the idea that many carcharodontosaurids had reduced forelimbs similar to those observed in abelisaurids such as Carnotaurus and most famously in Tyrannosaurus rex.

The researchers propose that forelimb reduction among three lineages of large-bodied predators is an example of convergent evolution, whereby not closely related organisms evolve the same traits. The fossils of Meraxes gigas show a remarkable degree of parallelism between latest-diverging tyrannosaurids and carcharodontosaurids.

Meraxes gigas limb bones.
Articulated right arm in medial view (I to III, hand digits first to third) top right and left foot in medial view (I to IV, pedal digits first to fourth) bottom Scale bars = 10 cm. Picture credit: Canale et al.

Helping to Define the Size of Giganotosaurus (G. carolinii)

Meraxes has the most complete cranium of any Carcharodontosaurinae, with a total skull length estimated at 1.27 metres which is comparable to the most complete specimen of Acrocanthosaurus (A. atokensis) with a skull size of 1.23 metres. Giganotosaurus has the next most complete skull among carcharodontosaurids, but it is missing part of the maxilla and several other bones, so estimating its total length has been problematical. Although the head of Meraxes was not as wide as the head of Giganotosaurus, the cranium of Meraxes is sufficiently similar to G. carolinii to permit an estimate for the length of the Giganotosaurus skull to be made. Based on this comparison, the skull of the largest Giganotosaurus specimen would have been around 1.62 metres long, making it one of the longest theropod skulls known to science.

Meraxes gigas Timeline
Cladogram depicting the temporal and geographical distribution of the Carcharodontosauridae family of theropod dinosaurs. At the time of their extinction these meat-eating dinosaurs seem to have been at their peak diversity. Picture credit: Canale et al.

The discovery of yet another super-sized carcharodontosaurid from Argentina demonstrates the high diversity of these theropods shortly before their extinction. Parallels can be drawn between the diversity of South American carcharodontosaurids and tyrannosaurs known from the Campanian faunal stage in western North America.

There are no reliable records of carcharodontosaurids in South America beyond the end of the Turonian stage of the Late Cretaceous, this great clade of theropods are believed to have become extinct around 90 million years ago.

To read a related article about another South American theropod with reduced forelimbs and fingers like a T. rex: Gualicho Sticks Two Fingers up at T. rex.

What’s in a Name

The genus name (Meraxes) is named after a female dragon from the Song of Ice and Fire series of books by George R. R. Martin, upon which the hugely successful television series “Game of Thrones” was based. The species name (gigas) comes from the Greek meaning giant.

The scientific paper: “New giant carnivorous dinosaur reveals convergent evolutionary trends in theropod arm reduction” by Juan I. Canale, Sebastián Apesteguía, Pablo A. Gallina, Jonathan Mitchell, Nathan D. Smith, Thomas M. Cullen, Akiko Shinya, Alejandro Haluza, Federico A. Gianechini and Peter J. Makovicky published in Current Biology.

3 07, 2022

Robust Roo from Papua New Guinea

By | July 3rd, 2022|Adobe CS5, Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Scientists have described a new genus of robust, late Pleistocene prehistoric kangaroo from fossils found in Papua New Guinea. Analysis suggests that it was not closely related to kangaroos found today in Australia.

Researchers from Flinders University examined two partial dentaries (lower jaw bones) that had been previously assigned to the Protemnodon genus and named P. nombe. They identified unique characteristics in the teeth and the shape of the bones that led them to conclude that the fossils were sufficiently different from other Protemnodon material to be assigned their own genus. The ancient kangaroo has been named Nombe nombe honouring the Nombe Rockshelter where the fossils were discovered.

Nombe nombe life reconstruction.
A life reconstruction of the prehistoric kangaroo Nombe nombe. Standing around 1.5 metres tall and weighing up to 60 kilograms, the thick dentary and strong teeth indicate Nombe evolved to eat tough leaves in the dense jungle landscape. Picture credit: Peter Schouten.

A New Guinea/Australia Land Bridge

During the Miocene Epoch, around 5-8 million years ago, lower global sea levels permitted a land bridge between Australia and Papua New Guinea to form. This led to a faunal interchange between the two regions. An ancient form of Australian kangaroo migrated northwards and entered the territory now known as Papua New Guinea. When sea levels rose and the Torres Strait was formed, these ancient kangaroos were able to evolve in isolation away from their Australian ancestors.

Nombe nombe dentaries.
Nombe nombe lower jaw bones. Holotype and referred specimen of Nombe nombe: holotype (PNG/82/40/23) partial right dentary in (a) buccal/lateral view, (b) lingual/medial view and (c) lower dentition in occlusal/dorsal view; (d) referred specimen (PM/82/40/19) partial left dentary in buccal/lateral view. Picture credit: Kerr and Prideaux.

Co-author of the scientific paper published in the Transactions of the Royal Society of South Australia, PhD student Isaac Kerr commented:

“The New Guinean fauna is fascinating, but very few Australians have much of an idea of what’s actually there.”

Co-author of the paper, Professor Gavin Prideaux (Flinders University), explained that excavations at the Nombe Rockshelter and elsewhere in central Papua New Guinea are providing palaeontologists with evidence of a unique ecosystem on the island, a biota dominated by prehistoric marsupials that were adapted to their mountainous, tropical environment. Flinders University hopes to be able to undertake more extensive fieldwork over the next three years and they are confident that these excavations will unearth new species.

Prehistoric Papua New Guinea
Life in the late Pleistocene on Papua New Guinea. The megafauna was dominated by extinct species of kangaroo and giant four-legged marsupials called diprotodontids, which in turn were hunted by Thylacines. Picture credit: Peter Schouten.

Everything Dinosaur acknowledges the assistance of a media release from Flinders University in the compilation of this article.

The scientific paper: “A new genus of fossil kangaroo from late Pleistocene New Guinea” by Isaac A. R. Kerr and Gavin J. Prideaux published in the Transactions of the Royal Society of South Australia.

2 07, 2022

“Travels with Trilobites” by Andy Secher

By | July 2nd, 2022|Adobe CS5, Book Reviews, Dinosaur Fans, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

We got sent a copy of the amazing “Travels with Trilobites” by world-renowned expert on the Trilobita Andy Secher. What a fantastic book! Trilobites are regarded by many scientists as being one of the most successful animals to have ever existed and their fossils are absolutely fascinating as well as stunningly beautiful. We can’t wait to read and then review this superbly illustrated guide to all things Trilobita!

Holding the "Travels with Trilobites" book.
Very excited to receive a copy of “Travels with Trilobites” by Andy Secher (field associate in palaeontology at the American Museum of Natural History – New York).

Published by Columbia University Press

Published by Columbia University Press the book includes forewards by Mark Norell, Kirk Johnson and Niles Eldredge. There are over 25,000 described species of trilobites and although entirely marine (as far as we know), they evolved into a myriad of forms. Many of the beautiful, full-colour photographs in the book show fossils from the author’s own extensive collection.

Front cover of "Travels with Trilobites".
The front cover of the beautifully illustrated “Travels with Trilobites” by Andy Secher published by Columbia University Press. It is an adventure in Palaeozoic marine fauna.

Andy Secher is a field associate in palaeontology at the prestigious American Museum of Natural History (New York). His own private collection comprises more than 4,000 trilobite specimens. The book provides the opportunity to explore one of the most enigmatic marine creatures of the Palaeozoic Era.

Team members at Everything Dinosaur are going to enjoy reading and then reviewing this wonderful book.

To purchase “Travels with Trilobites” by Andy Secher, visit the Columbia University Press website and search for Andy Secher: Visit Columbia University Website.

27 06, 2022

Frozen Baby Mammoth Discovered in the Klondike

By | June 27th, 2022|Adobe CS5, Animal News Stories, Dinosaur and Prehistoric Animal News Stories, Main Page, Palaeontological articles, Photos/Pictures of Fossils|0 Comments

Gold miners working at Eureka Creek in the Klondike Region of Yukon Province in Canada have discovered the frozen remains of a baby woolly mammoth. The calf, which is female is estimated to have lived around 30,000 years ago and it represents the best-preserved woolly mammoth specimen ever found in North America.

Baby mammoth from the Klondike of Yukon
The baby mammoth identified as a female, is the best-preserved woolly mammoth (Mammuthus primigenius) found to date in North America. It is thought to be around 30,000 years old. Picture credit: Yukon Government.

“Big Baby Animal”

The discovery was made on June 21st, the Northern Hemisphere solstice and also appropriately, Canada’s National Indigenous Peoples Day. The Klondike gold fields lie within the Trʼondëk Hwëchʼin Traditional Territory. Trʼondëk Hwëchʼin elders have named the mammoth calf Nun cho ga, meaning “big baby animal” in the indigenous people’s (Hän) language.

Ice Age animal remains are quite commonly found in the Yukon area as they erode out of thawing permafrost, however, mummified remains complete with skin and hair are exceptionally rare.

Minister for Tourism and Culture, Ranj Pillai of the Yukon Territory Administration commented:

“The Yukon has always been an internationally renowned leader for ice age and Beringia research. We are thrilled about this significant discovery of a mummified woolly mammoth calf: Nun cho ga. Without strong partnerships between placer miners, Trʼondëk Hwëchʼin, and the Yukon government, discoveries like this could not happen.”

Woolly Mammoths.
Woolly Mammoths (M. primigenius) an iconic animal of the Ice Age.

Vertebrate palaeontologist Dr Grant Zazula added:

“As an ice age palaeontologist, it has been one of my lifelong dreams to come face to face with a real woolly mammoth. That dream came true today. Nun cho ga is beautiful and one of the most incredible mummified ice age animals ever discovered in the world. I am excited to get to know her more.”

Comparisons with Lyuba

The discovery of the superbly preserved corpse will provide scientists with an opportunity to compare Nun cho ga with Lyuba, a mammoth calf discovered in Siberia back in 2007. Lyuba lived a few thousand years earlier than the Yukon mammoth (circa 41,800 years), researchers will have the opportunity to compare the genetic health of the mammoth population and plot any changes between the older Lyuba and Nun cho ga which lived, around 12,000 years later.

The baby Woolly Mammoth known as Lyuba.
The 42,000-year-old baby mammoth Lyuba. Picture credit: Uppa/Photoshot (Daily Telegraph News).

The discovery of Nun cho ga is not the first woolly mammoth calf found in North America. In 1948, a partial mammoth calf, nicknamed Effie, was found at a gold mine in Alaska.

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