⏰ when
When did the first mammal fossils appear in the fossil record?
MammalsEvolution
Quick Answer
The earliest widely accepted mammal fossils date to about 225 million years ago, in the Late Triassic.
The Full Story
The first mammals evolved from mammal-like synapsid ancestors during the Late Triassic, roughly 225 million years ago. Fossils from early mammaliaforms such as Morganucodon and related forms show a small, shrew-like body plan. These animals lived alongside the first dinosaurs and were already developing key mammalian traits such as specialized teeth and a more advanced jaw structure. Exact dates vary a little by fossil site, but the origin of mammals is firmly placed in the Late Triassic.
Key Facts
1.~225 million years ago
2.Late Triassic period
3.Early mammaliaforms had differentiated teeth
YouTube Angle
Suggested video title for this topic:
"The tiny furry survivors that appeared while dinosaurs were rising"