Link to USGS home page
A Tapestry of Time and Terrain:
The Union of Two Maps - Geology and Topography
 		Tapestry Main Page
top bar
Back to Rocks of Ages Lower Tertiary Rocks  
Lower Tertiary rocks
The rocks highlighted here date from the early part of the Tertiary Period, from 66 million years ago to 38 million years ago. The Tertiary is divided into epochs, the two oldest of which are shown here; the Eocene (54 to 38 million years ago) and the Paleocene (66 to 54 million years ago).

Lower Tertiary features of the United States:
bottom bar

U.S. Department of the Interior
U.S. Geological Survey
Contact: Administrator
Last Modification: March 25, 2002 (keb)
USGS Privacy Policy