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.
Location of the Appalachian Basin Geologic Mapping Project. The study area comprises the Valley and Ridge and Appalachian Plateaus physiographic provinces.
Public Domain.
