Geology of Badlands National Park
http://www.nps.gov/badl/naturescience/geologicformations.htm

National Park Service (NPS)


This page is an introduction to the 75 million years of accumulation and intermittent periods of erosion that has resulted in the Badlands National Park. The history of the Oglicene beds of the Park, one of the world's richest vertebrate fossil sites, is also described. A downloadable PDF that describes the erosion that is responsible for the geology of the Park in more detail is linked to the site.

This resource is referenced here:
Subject: Geoscience:Geology:Geomorphology, Historical Geology
Resource Type: Scientific Resources:Overview/Reference Work
Topics: Time/Earth History