Image of the Geologic Map of North America
By Geosciences and Environmental Change Science Center
2005 (approx.)
Sources/Usage
Public Domain.
Public Domain
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
