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Fossil find shows man’s earliest ancestors lived on Dorset’s ‘Jurassic Coast’ in the shadow of dinosaurs

Fossils of the oldest mammals related to mankind have been discovered for the first time on the ‘Jurassic Coast’ of Dorset. The two teeth are from small, rat-like creatures that lived 145 million years ago in the shadow of the dinosaurs. And one of the fossils has been named after the landlord of a pub […]

Joe Mellor by Joe Mellor
2017-11-08 01:23
in News, Science
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Fossils of the oldest mammals related to mankind have been discovered for the first time on the ‘Jurassic Coast’ of Dorset.

The two teeth are from small, rat-like creatures that lived 145 million years ago in the shadow of the dinosaurs.

And one of the fossils has been named after the landlord of a pub near to where they were discovered by an undergraduate student.

They are the earliest undisputed fossils of mammals belonging to the line that led to human beings.


Dr Steve Sweetman Grant Smith & Professor Dave Martill (l-r).

They are also the ancestors to most mammals alive today, including creatures as diverse as the Blue Whale and the Pigmy Shrew.

The findings of Dr Steve Sweetman, Research Fellow at the University of Portsmouth, and his colleagues were published in the Journal Acta Palaeontologica Polonica.

Dr Sweetman, whose primary research interest concerns all the small vertebrates that lived with the dinosaurs, identified the teeth.

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But it was University of Portsmouth undergraduate student Grant Smith who made the discovery.

Dr Sweetman said: “Grant was sifting through small samples of earliest Cretaceous rocks collected on the coast of Dorset as part of his undergraduate dissertation project in the hope of finding some interesting remains.

“Quite unexpectedly he found not one but two quite remarkable teeth of a type never before seen from rocks of this age.

“I was asked to look at them and give an opinion and even at first glance my jaw dropped!”

He continued: “The teeth are of a type so highly evolved that I realised straight away I was looking at remains of Early Cretaceous mammals that more closely resembled those that lived during the latest Cretaceous – some 60 million years later in geological history.


These are fossil teeth under electron microscope.

“In the world of palaeontology there has been a lot of debate around a specimen found in China, which is approximately 160 million years old. This was originally said to be of the same type as ours but recent studies have ruled this out.

“That being the case, our 145 million year old teeth are undoubtedly the earliest yet known from the line of mammals that lead to our own species.”

Dr Sweetman believes the mammals were small, furry creatures and most likely nocturnal.

One, a possible burrower, probably ate insects and the larger may have eaten plants as well.

Dr Sweetman added: “The teeth are of a highly advanced type that can pierce, cut and crush food.

“They are also very worn which suggests the animals to which they belonged lived to a good age for their species. No mean feat when you’re sharing your habitat with predatory dinosaurs!”

The teeth were recovered from rocks exposed in cliffs near Swanage which has given up thousands of iconic fossils.

Mr Smith, now reading for his Master’s degree at The University of Portsmouth, said that he knew he was looking at something mammalian but didn’t realise he had discovered something quite so special.

His supervisor, Professor Dave Martill, confirmed that they were mammalian, but suggested mammal expert Dr Sweetman should see them.


This is a reconstruction of the small, rat-like creatures that lived 145 million years ago in the shadow of the dinosaurs.

Prof Martill said: “We looked at them with a microscope but despite over 30 years’ experience these teeth looked very different and we decided we needed to bring in a third pair of eyes and more expertise in the field in the form of our colleague, Dr Sweetman.

“Steve made the connection immediately, but what I’m most pleased about is that a student who is a complete beginner was able to make a remarkable scientific discovery in palaeontology and see his discovery and his name published in a scientific paper.

“The Jurassic Coast is always unveiling fresh secrets and I’d like to think that similar discoveries will continue to be made right on our doorstep.”

One of the new species has been named Durlstotherium newmani, christened after Charlie Newman, the landlord of the Square and Compass pub in Worth Matravers, close to where the fossils were discovered.

Plant that was once munched on by dinosaurs found growing in the wild 

New dinosaur species discovered

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