All about dinosaurs, fossils and prehistoric animals by Everything Dinosaur team members.
12 09, 2015

New Species of Ancient Human Described

By | September 12th, 2015|General Teaching, Key Stage 3/4|Comments Off on New Species of Ancient Human Described

Homo naledi – New species of Hominin

A team of international scientists including researchers from the University of Witwatersrand (Evolutionary Studies Institute), South Africa have announced the discovery of a new species of human – Homo naledi.  The fossils, some 1,550 of them, have been collected from a cavern deep in a limestone cave system in the Cradle of Humankind UNESCO World Heritage site.  These fossils, the largest collection of hominin fossils found at a single location in the whole of Africa, will provide palaeoanthropologists with unprecedented levels of data.

Laying Out the Collection of Homo naledi Fossils

Homo naledi fossils

The most extensive hominin fossil find from Africa.

Picture credit: John Hawks/University of Wisconsin-Madison/University of Witwatersrand

Redefining What it Means to be Human

The bones were collected over a period of three weeks, following their initial discovery in 2013.  What puzzles the scientists is how did the bones get to be in the deep cave?  Bones and other debris can be washed in over time due to flooding, in this instance there is no evidence to suggest deposition of fossil material as a result of water transport.  Occasionally, such caverns are used as dens by carnivores, the bones of victims are preserved as evidence but there are no bite marks or evidence of scavenging on the bones.

Homo naledi

One theory is that these bones represent the dead bodies of individuals who were carried into the cave and deliberately placed there.  This suggests that Homo naledi was capable of abstract thought and, potentially, showing reference for the dead.

Co-author of the scientific paper published in “Elife”, Professor Lee Berger (University of Witwatersrand) stated:

“We are going to have to contemplate some very deep things about what it is to be human.  Have we been wrong all along about this kind of behaviour that we thought was unique to modern humans?”

To read a more in-depth article on Homo nalediNew Human Species from South Africa.

Dating the Fossils

Calculating the age of the fossils is proving difficult, but these bones could be up to three million years old.   Homo naledi had a brain about the size of a gorilla’s but a much smaller body, standing a little over a metre tall when fully grown.  Where it sits on the human evolution tree, very much depends on obtaining an accurate date for the fossil material.

Safari Ltd have produced a set entitled the “evolution of mankind” – a series of models that depict hominin evolution. To see the Safari Ltd model range: Wild Safari Prehistoric World.

12 09, 2015

Mapping the Dinosaur Heritage of Western Australia

By | September 12th, 2015|Dinosaur and Prehistoric Animal News Stories, Dinosaur Fans, Main Page|0 Comments

Dinosaur Tracks Getting Mapped in Western Australia

The extensive dinosaur tracks that can be found along the coast of western Australia are getting plenty of tender loving care as a team of scientists led by researchers from the University of Queensland attempt to map and produce three-dimensional images of all these ancient trace fossils.  Researchers are setting out to map the dinosaur heritage of western Australia.

The fossilised footprints, permitting palaeontologists to go “walking with dinosaurs” are found near to the town of Broome (Western Australia) and north along the coast of the Dampier Peninsula, a relatively remote area, some nine hundred kilometres south-west of the city of Darwin.  The dinosaur trackways were granted National Heritage status, after a successful lobbying campaign, back in 2011, yet scientists have not been able to map all the tracks and prints preserved in this area, famous for its high tides.

Australia’s Dinosaur Heritage

The tides are part of the problem, this is a macro-tidal environment with tidal surges in excess of ten metres frequently occurring.  A number of prints are only exposed for a few hours a day whilst other tracks are only exposed on extremely low tides that occur just a couple of times per year.

A Jumble of Sauropod Prints Exposed on the Shoreline

These tracks could have been made by a herd of Sauropods.

These tracks could have been made by a herd of sauropods.

Picture credit: Dr Steve Salisbury

The Dinosaurs of Western Australia

Back in the spring of 2014, Everything Dinosaur reported in this blog on the calls for more research to be done on this unique fossil assemblage.   The hundreds of tracks represent many kinds of Early Cretaceous dinosaurs – theropods, stegosaurs, ornithopods and sauropods.  Some of the footprints believed to have been made by sauropods (long-necked, large-bodied, long-tailed giants) measure over 1.5 metres in diameter, making them some of the largest dinosaur trace fossils known to science.

To read this earlier article: Call for More Work to be Done on Western Australia’s Dinosaur Tracks.

Although, some of the tracks, especially the three-toed (tridactyl) prints are very obvious, the only way the extent of the tracks can be fully appreciated is by viewing them from the air.  Drones and light aircraft have been employed by the researchers to photograph and plot the dinosaur footprints.  In addition, some of the drones and aircraft have been kitted out with LiDAR equipment, which is helping to create a three-dimensional map of the terrain.  LiDAR (light detection and ranging), uses pulsating laser lights to plot features in the landscape in combination with satellite positioning technology to make highly accurate maps of the tracks.

A Variety of Research Methods Employed

More mundane research methods are also being employed such as photographing individual prints and making silicon rubber moulds.  All this research is very worthwhile as some of the prints are being rapidly eroded away by the action of the sea and tides.

Drones are Used to Plot the Dinosaur’s Movements

Dr. Salisbury and colleagues are using drones to plot the trackways.

Dr Salisbury and colleagues are using drones to plot the trackways.

Picture credit: Damian Kelly

Early Cretaceous Dinosaur Tracks

It is believed that these tracks were made in the Early Cretaceous, around 130 million years ago (Barremian faunal stage of the Cretaceous), these fossils are something like twenty million years older than the dinosaur fossils associated with Queensland such as the titanosaurs Diamantinasaurus and Wintonotitan.

Commenting on the mapping project, Dr Steve Salisbury (University of Queensland) stated:

“These tracks are at least 15 to 20 million years older than the majority of dinosaur fossils that have been found at sites in eastern Australia.  We can, to a degree, accurately reconstruct scenes that happened 130 million years ago.  That’s not imagination, that’s piecing it together from the evidence found in the rocks.  It’s a powerful way of bringing these ancient worlds back to life.”

We at Everything Dinosaur wish the research team every success with their colossal mapping effort.  They are helping to preserve and to secure data from a very important Early Cretaceous fossil site.

CollectA have produced a number of models of dinosaurs that once roamed Gondwana, including titanosaurs, stegosaurs and theropods: CollectA Deluxe Prehistoric World Figures.

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