Mammals of the Badlands. By Christina Hurley. Badlands: Geologic History. Started forming about 75 million years ago Are composed of 6 different formations Pierre Shale Yellow Mounds Chadron Formation Brule Formation Rockyford Ash Sharps Formation. Pierre Shale.
Mammals of the Badlands
By Christina Hurley
“There once was a goose named Mon. He was a mongoose.” – Allison Moon
Means “middle horse”
Appeared suddenly (geologically speaking)
Preceding horses had 4 toes, Mesohippus only had 3
Cerebral hemispheres notably larger
Brain more distinctly equine
Last 3 premolars are like the 3 molars
Like today’s horses have 6 grinding cheek teeth
B - nimravid; A, C - felids; D - marsupial
Illustration of different evolution theories. Third being the most current.