-Deposited from 28-30 million years ago

-Lighter Colored

-Volcanic eruptions supply ash for the Sharps Formation.

-With Brule, Sharps form the "more rugged peaks and canyons ".

-A thick layer of volcanic ash

-Forms bottom layer of the Sharps Formation

-Tannish brown

-Deposited between 30-34 million years ago

-Climate dryer and cooled, giving way to savannah

-Deposited sandstone mark courses of rivers

-Red layers found are "fossil soils" called "paleosol"

Deposition that has occurred in the Badlands

-Greyish

-Deposited between 34-37 million years ago

-Rivers flood to deposited new layer

-Alligator fossils

-Most fossils are early mammals

Sharps Rockyford Brule Chardon