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.
Unusual polygonal fractures in the upper Navajo Sandstone (Jurassic) along the Burr Trail Road (near Boulder, Utah) in Grand Staircase-Escalante National Monument.
Public Domain.
