All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
4 12, 2015

Time for a New Geological Epoch?

By | December 4th, 2015|Key Stage 3/4|Comments Off on Time for a New Geological Epoch?

Goodbye Holocene Say Hello to the Anthropocene

As world leaders, scientists, politicians, environmentalists and lobbyists gather in Paris for perhaps the most significant event in modern human history, the global conference on the warming of our planet (COP 21), it is worth reflecting that it already may be too late to reverse the consequences.  Most scientists now agree that climate change is a due in most part to  our species (Homo sapiens) and our impact on the environment.  For the uninitiated, COP 21 stands for the 21st Conference of the Parties to the United Nations Framework Convention on Climate Change.   A global agreement is being sought to limit fossil fuel use and other human activities that could lead to a catastrophic rise in the average annual temperature of Earth.

Is it Time to Define a New Geological Epoch?

Such is the rate of climate change, the totality of climate change and the scale, that many scientists have proposed that this time in the history of our planet deserves its own epoch.  Currently, we are living in the Holocene Epoch (it means “recent time”).  This epoch was defined in the last five years or so by the International Commission on Stratigraphy, the academic body responsible for dividing up the 4.57 billion years or thereabouts of Earth’s history into more manageable chunks of time such as eons, eras, periods and epochs.

The Holocene Epoch is defined as the last interglacial period, it began around 11,500 years ago, with the end of the last Ice Age.

At the turn of the Century, scientists Paul Crutzen and Eugene Stoermer introduced the idea of the Anthropocene Epoch, a new epoch to note the dramatic change on our planet caused by human beings and their activities.  The Anthropocene is not an officially recognised scientific term.

Next year, a working group headed by Professor Jan Zalasiewicz of Leicester University will put forward to the International Commission on Stratigraphy a formal proposal about adopting the term Anthropocene.  This could set in motion a chain of events that will see the Anthropocene officially adopted as a geological epoch.

It is a sobering thought for many of us, we have lived through a change of millennium, now we could be on the cusp of having lived through a time when one geological epoch was replaced by another.

4 12, 2015

Fearsomely Fanged Triassic Pterosaur from Utah

By | December 4th, 2015|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page|0 Comments

New Pterosaur Genus Discovered in Utah

Much excitement was generated at the annual Society of Vertebrate Palaeontology conference in Dallas (Texas), when Brooks Britt, an Associate Professor of Geology at Brigham Young University (Utah) updated the audience on a remarkable fossil discovery from north-eastern Utah, close to the State border with Colorado.  During the Late Triassic, the western part of North America was covered in vast sand dunes.  The area resembled the Sahara of today.  Just like in the Sahara, there were pockets of life clustered around water sources.  Associate Professor Britt and his colleagues have for some years now been excavating the fossilised remains of fauna that lived around an oasis approximately 210 million years ago.  For these residents, surrounded by the desert, their collective luck ran out when during a severe drought the water evaporated and much of this ancient ecosystem was wiped out.  The bad luck of the Triassic animals is good fortune for palaeontologists as they have been able to piece together a remarkable picture of the fauna of this Late Triassic oasis.

Triassic Pterosaur

One of the most impressive discoveries made so far, came in 2014.  The quarry known as the Saints and Sinners Quarry had been explored for more than a decade.  The beds that make up the quarry are fossiliferous as they represent lake shoreline sediments, rocks laid down at an oasis that was surrounded by vast desert dunes.  Brigham Young University student Scott Meek unearthed from the sandstone the partial remains of a pterosaur.  Pterosaur fossils from the Late Triassic and Early Jurassic are rare in North America.  The specimen has yet to be formally described and named but it does represent a new species (most likely a member of the Dimorphodontidae family or possibly ancestral to this pterosaur family).

An Concept Drawing of the New Late Triassic Pterosaur from Utah

Four-fanged hunter of the oasis.

Four-fanged hunter of the oasis.

Picture credit: Josh Cotton

Although not large when compared to later members of the Pterosauria, the Utah specimen had a wingspan of around 1.3 metres, making it about the size of a modern day European Herring Gull (Larus argentatus).  It had a large head and a jaw lined with over one hundred pointed teeth (110 in total).  Four of the teeth, located towards the front of the lower jaw were more like fangs.  The largest of them measures 2.5 centimetres long.  This is one pterosaur that would have looked very mean indeed!  The orbits (eye-sockets) are smaller than seen in other members of the Dimorphodontidae family, perhaps as this flying reptile lived in a very bright and sunlit environment with lots of glare from the surface of the lake and the surrounding desert it may have evolved smaller eyes to help protect its vision from the excessive bright light, although this is only speculation on our part and we await with interest the scientific paper on the pterosaur specimen that will probably be published next year.

A Triassic Oasis – Teeming with Life

Associate Professor Britt specialises in studying sediments.  These sediments help to build up a picture of the climate and the environment at the time.  These sandstones have also revealed what happened to the animals that depended on the oasis and why the fossil assemblage came to be formed, Brooks Britt explained:

“The animals likely died during a severe drought, and the sediments indicate their carcasses were buried when the rains returned to normal and the lake filled, with the lapping waves burying the bones with sand.”

The fossil is also relatively three-dimensional.  Most pterosaur fossil bones are easily crushed and distorted.  Associate Professor Britt added:

“Outside of a find in Greenland, this is the first good Triassic pterosaur from North America.”

The scientists also found a wealth of other vertebrate fossils, including at least twenty individual Coelophysoid theropod specimens, plus the teeth of a much more substantial meat-eating dinosaur.  In addition, cursorial crocodylomorph fossils (the victim in the pterosaur illustration), along with evidence of sphenosuchians and a drepanosaurid, a representative of a bizarre group of Late Triassic reptiles that may have been arboreal, were discovered.

Why Didn’t the Pterosaur Fly Away?

All the other vertebrate fossils found at the dig site are from entirely terrestrial animals.  These animals would have been effectively trapped by the desert and not capable of travelling the distance required to find a new habitat when the oasis began to dry up, but why didn’t the pterosaur just fly away?  Perhaps other pterosaurs were able to leave and this fossil represents an old or sick individual.  Or alternatively, the shape of the pterosaur’s wings may provide a clue.  The wings of this creature are relatively short and broad, suggesting that they were not adapted to long distance flight.  These wings are more suited to short flights with the need to dodge and to weave, perhaps round obstacles such as trees.  This new pterosaur may have been an agile flier well suited to a life hunting in the trees close to the lake, but once the lake dried up, it may not have been capable of travelling the large distance required in order to find a new home.

We look forward to reading more about the “Saints and Sinners” pterosaur in 2016.

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