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.
Latest Earthquakes | Chat Share
The Core Research Center collection includes oil shale cores from the Green River Formation in Colorado, Utah and Wyoming.
Oil Shale cores are listed as being in the GREEN RIVER Formation.
More information on Oil Shale can be found at:USGS Energy Resources Program: Oil Shale