Topic: Mammal - Wikipedia

Origins. Synapsida, a clade that contains mammals and their extinct relatives, originated during the Pennsylvanian subperiod (~323 million to ~300 million years ago), when they split from reptilian and avian lineages. Crown group mammals evolved from earlier mammaliaforms during the Early Jurassic.The cladogram takes Mammalia to be the crown group.

1 Re: What information does relative dating provide to paleontologists

Hi. Author well done!

2 Re: What information does relative dating provide to paleontologists

An Update On The Triceratops Fossil That Contained Soft. In March of 2013, I wrote about soft tissue that had been found in the fossilized remains of a Triceratops horridus, which is supposed to be about 65 million years old.One of the scientists who found the tissue and published a paper on it in the peer-reviewed literature 1 (Mark Armitage) was subsequently fired from his position at California State University Northridge.