The Curious Case of the T-Rex Footprint.

It was Professor Phil Manning who discovered the first known Tyrannosaur footprint in the Hell Creek formation in Montana.
He’d seen it on the last day of an expedition in 2006 but did not have the time to investigate further, so he returned the following year and began to search for it all over again.
It is rather unremarkable to look at and unless you knew what you were looking at you wouldn’t notice it.
Rather thinner than one would expect a foot to be, the toes only just joined to the main foot and it is raised in profile rather than indented.
And it is much darker than the rock around it.
It measures around 29 inches long and similarly wide and was formed when a T-Rex walked in the clay of a flood plain, compressing it enough that it became tougher than the rock surrounding it and so it survived, just, when the rock around it eroded.
As well as the footprint itself being the right size and shape for a T-Rex, the other compelling evidence that this is genuinely from a T-Rex is that it was discovered right where it is known T-Rex died, and therefore lived.
One that was claimed to have been found in Mexico was disputed and dismissed as there was no sign anywhere near it that T-Rex was ever there.
Now one has been found, others will come to light but considering the timescale it is astounding that even one survives.
via Historical Honey The Curious Case of The T-Rex Footprint » Historical Honey.

Did Man Evolve because that Asteroid wiped out the Dinosaurs?

1345351768_1e730a4876_b1A hadrosaur Skeleton, Field Museum (Credit: Lisa Andres)
by Paul Rodgers.
Dinosaurs would be walking the Earth today if it weren’t for a “colossal” piece of bad luck.
Had the asteroid that brought their reign to an end struck at “a more convenient time” they could well have survived the cataclysm, according to new research.
And that in turn would mean no humans.
“If dinosaurs didn’t go extinct, then mammals would have never had their opportunity to blossom.
So if it wasn’t for that asteroid, then humans probably wouldn’t be here. It’s as simple as that,” said Dr Stephen Brusatte, a palaeontologist at Edinburgh University’s school of geosciences.
“Not only did a giant asteroid strike, but it happened at the worst possible time, when their ecosystems were vulnerable,” said Dr Brusatte, a co-discoverer of the Pinnochio rex tyrannosaur (Qianzhousaurus sinensis) announced in May.
“It was a perfect storm of events, when dinosaurs were at their most vulnerable.”
A triceratops at the American Museum of Natural History (Credit: Wikipedia)
The arrival of the Chicxulub bolide (comet or giant meteorite) 66 million years ago, in what is now Mexico’s Yucatan Peninsula, left a crater 20km deep and 180km in diameter and caused a global catastrophe including firestorms, tsunamis, and earthquakes.
The 10km wide rock released enough dust, ash, and aerosols into the air to create a global “impact winter” that lasted for a decade.
The Cretaceous-Paleogene extinction event (formerly known as the Cretaceous-Tertiary) is thought to have killed three quarters of the earth’s species.
At particular risk were large creatures – the dinosaurs – that depended on equally large food intake.
Only those dinosaurs that could fly survived, eventually evolving into today’s birds.
Read on via The (Atrocious) Luck Of The Dinosaurs.

Changyuraptor, 4 winged Dinosaur had huge tail feathers.

Changyuraptor, a 125 million year old  four winged dinosaur with record breaking tail feathers from China.  Image Credit: Stephanie Abramowicz
Contributor: John Pickrell is the editor of Australian Geographic.
IN THE EARLY stages of evolving flight, feathered dinosaurs tried an interesting experiment: they developed four wings.
These small dinosaurs – such as Microraptor, Anchiornis and Xiaotingia – had large flight feathers on their hind limbs as well as their fore limbs, and they had long bony tails, similarly replete with large feathers.
It appears that many early birds, such as Archaeopteryx, may also have had long feathers on their hind limbs.
It was only later that birds developed the characteristically bald legs that (most) birds have today, and became aerodynamically stable on two wings and a much-reduced tail.
Microraptor was the first of the four-winged dinosaurs to be discovered, in 2003, and it was tiny for a dinosaur: approximately 1kg in weight and similar to a crow or a raven in size.
Miniaturisation, experts thought, was an essential step in developing flight.
But now a totally new four-winged dinosaur has been discovered, and it was much larger.
Changyuraptor yangi – described in the journal Nature Communications – would have been around 4kg in weight and about the size of a turkey.
It also has a really unusual feature: an incredibly long tail with 30cm feathers that trailed out behind the body.
These tail feathers were around 30 per cent of the length of the skeleton, making them the longest known feathers of any (non-bird) dinosaur.
Read further via New four-winged dinosaur has record-breaking tail feathers – Australian Geographic.

Heavily Armoured Dinosaur had Ginger camouflage to deter predators.

An illustration of Borealopelta markmitchelli.
The study suggests that it displayed a camouflage effect known as counter-shading. Illustration: Julius Csotonyi/Courtesy of the Royal Tyrrell Museum of Palaeontology.
It was built like a tank, covered in armour, and weighed about the same as a caravan – but this beefy dinosaur was still at risk of being gobbled up by predators, scientists have discovered.
Thought to have lived about 110m years ago, the giant herbivore is believed to be a type of heavily armoured dinosaur known as a nodosaur and would have reached up to 5.5 metres in length.
On show at the Royal Tyrrell Museum of Paleontology in Alberta, Canada, its fossilised remains have stunned researchers, who have hailed it as the best-preserved armoured dinosaur in the world.
Not only are its bones preserved, but the fossil also boasts the creature’s armour, stomach contents and even a thin film of organic material, thought to be remains of pigments from the skin and horns.
Source: Heavily armoured dinosaur had ginger camouflage to deter predators – study | Science | The Guardian

Stegosaurus, Natural History Museum, London.


The image is one of a series by palaeoartist Robert Nicholls, commissioned by the Museum and based on its latest star exhibit, the most complete Stegosaurus skeleton ever found.
The fossil remains were discovered in the rocks of the Morrison Formation, a geological deposit in the United States of America.
The dinosaur lived during the Late Jurassic, approximately 150 million years ago.
Most of the body is preserved, including the back plates and tail spines, which scientists think were used to lash out at predators.
via Stegosaurus strikes out | Natural History Museum.