An official website of the United States government
Here’s how you know
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.
Google Analytics Dashboard for Radiometric ages of some Cretaceous and Tertiary volcanic and intrusive rocks in South-central Arizona
Radiometric ages of some Cretaceous and Tertiary volcanic and intrusive rocks in South-central Arizona