fbpx

Oldest dinosaur in Africa discovered in Zimbabwe – study




A long-necked dinosaur with jagged teeth and a long tail roamed Zimbabwe 230 million years ago, new fossil analysis has revealed (artist's impression pictured)

A long-necked dinosaur with jagged teeth and a long tail roamed Zimbabwe 230 million years ago, new fossil analysis has revealed.

The dinosaur, dubbed Mbiresaurus raathi, was around six feet long and weighed anywhere from 20-65lbs, and is the oldest dinosaur found in Africa yet.

‘The discovery of Mbiresaurus raathi fills in a critical geographic gap in the fossil record of the oldest dinosaurs and shows the power of hypothesis-driven fieldwork for testing predictions about the ancient past,’ said Dr Christopher Griffin, from the Virginia Tech College of Science.

‘These are Africa’s oldest-known definitive dinosaurs, roughly equivalent in age to the oldest dinosaurs found anywhere in the world.

‘The oldest known dinosaurs — from roughly 230 million years ago, the Carnian Stage of the Late Triassic period — are extremely rare and have been recovered from only a few places worldwide, mainly northern Argentina, southern Brazil, and India.’

A long-necked dinosaur with jagged teeth and a long tail roamed Zimbabwe 230 million years ago, new fossil analysis has revealed (artist's impression pictured)

A long-necked dinosaur with jagged teeth and a long tail roamed Zimbabwe 230 million years ago, new fossil analysis has revealed (artist’s impression pictured)

The skeleton of Mbiresaurus raathi was found in northern Zimbabwe, with just parts of its hand and portions of its skull missing.

Dr Sterling Nesbitt, an author of the study, said: ‘Early dinosaurs like Mbiresaurus raathi show that the early evolution of dinosaurs is still being written with each new find and the rise of dinosaurs was far more complicated than previously predicted.’

 ] Christopher Griffin works at uncovering fossils buried in the ground in northern Zimbabwe in 2017. (credit: Murphy Allen for the Paleobiology & Geobiology Research Group at Virginia Tech)

An analysis of its fossilised remains indicates that Mbiresaurus stood on two legs and had a relatively small head, with small, serrated, triangular teeth.

This suggests it was likely a herbivore or an omnivore, according to Dr Griffin.

‘We never expected to find such a complete and well-preserved dinosaur skeleton,’ said Dr Griffin.

‘When I found the femur of Mbiresaurus, I immediately recognized it as belonging to a dinosaur and I knew I was holding the oldest dinosaur ever found in Africa.

‘When I kept digging and found the left hip bone right next to the left thigh bone, I had to stop and take a breath — I knew that a lot of the skeleton was probably there, still articulated together in life position.’

The skeleton of Mbiresaurus raathi was found in northern Zimbabwe, with just parts of tits hand and portions of its skull missing

The skeleton of Mbiresaurus raathi was found in northern Zimbabwe, with just parts of tits hand and portions of its skull missing

Alongside Mbiresaurus, the researchers found a range of other fossils, including a herrerasaurid dinosaur, early mammal relatives such as cynodonts, armored crocodylian relatives such as aetosaurs, and ‘bizarre, archaic reptiles’ known as rhynchosaurs.

They hope the findings will help to shed light on the timing and location of early dinosaur migrations.

When Earth’s continents were one – a supercontinent known as Pangea – the climate was thought to have been divided into climate belts, which influenced the distribution of animals.

Latitudinal belts were thought to have strong humid and arid climates, while higher latitudes and lower tropics were more temperate.

‘Because dinosaurs initially dispersed under this climatic pattern, the early dispersal of dinosaurs should therefore have been controlled by latitude,’ Dr Griffin explained.

An analysis of its fossilised remains indicates that Mbiresaurus stood on two legs, and its head was relatively small, with small, serrated, triangular teeth

An analysis of its fossilised remains indicates that Mbiresaurus stood on two legs, and its head was relatively small, with small, serrated, triangular teeth

Alongside Mbiresaurus, the researchers found a range of other fossils, including a herrerasaurid dinosaur, early mammal relatives such as cynodonts, armored crocodylian relatives such as aetosaurs, and 'bizarre, archaic reptiles' known as rhynchosaurs

Alongside Mbiresaurus, the researchers found a range of other fossils, including a herrerasaurid dinosaur, early mammal relatives such as cynodonts, armored crocodylian relatives such as aetosaurs, and ‘bizarre, archaic reptiles’ known as rhynchosaurs

‘The oldest dinosaurs are known from roughly the same ancient latitudes along the southern temperate climate belt what was at the time, approximately 50 degrees south.’

 Christopher Griffin holds in his hand portion of the lower jaw of Mbiresaurus in Virginia Tech’s Derring Hall. (credit: Zach Murphy for the Paleobiology & Geobiology Research Group at Virginia Tech)

The researchers purposefully targeted northern Zimbabwe, as it fell along this climate belt and bridged the gap between southern Brazil and India during the Late Triassic Age.

‘The discovery of the Mbiresaurus is an exciting and special find for Zimbabwe and the entire paleontological field,’ said Michel Zondo, a curator and fossil preparer at the Natural History Museum of Zimbabwe.

‘The fact that the Mbiresaurus skeleton is almost complete makes it a perfect reference material for further finds.

‘It is the first sauropodomorph find of its size from Zimbabwe, otherwise most of our sauropodomorph finds from here are usually of medium- to large-sized animals.’

HOW THE DINOSAURS WENT EXTINCT AROUND 66 MILLION YEARS AGO

Dinosaurs ruled and dominated Earth around 66 million years ago, before they suddenly went extinct.

The Cretaceous-Tertiary extinction event is the name given to this mass extinction.

It was believed for many years that the changing climate destroyed the food chain of the huge reptiles.

In the 1980s, paleontologists discovered a layer of iridium.

This is an element that is rare on Earth but is found  in vast quantities in space.

When this was dated, it coincided precisely with when the dinosaurs disappeared from the fossil record.

A decade later, scientists uncovered the massive Chicxulub Crater at the tip of Mexico’s Yucatán Peninsula, which dates to the period in question.

Scientific consensus now says that these two factors are linked and they were both probably caused by an enormous asteroid crashing to Earth.

With the projected size and impact velocity, the collision would have caused an enormous shock-wave and likely triggered seismic activity.

The fallout would have created plumes of ash that likely covered all of the planet and made it impossible for dinosaurs to survive.

Other animals and plant species had a shorter time-span between generations which allowed them to survive.

There are several other theories as to what caused the demise of the famous animals.

One early theory was that small mammals ate dinosaur eggs and another proposes that toxic angiosperms (flowering plants) killed them off.




%d bloggers like this: