A Geological Tour of Denver, Golden, and Colorado's Front Range

Pericles Press Home | Book | Contact Us/Ordering

A Theory | Seven Nations | Governments and Empires | Geological Past

Geologic Time Period

The Pierre Shale Formation

Pierre Shale on Rooney Road

Pierre Shale - A view skyward, from the bottom - The ocean layers on the right were laid down earlier, and become progressively younger, moving to the left. The youngest layers are still some 70 million years old.

The Pierre Shale