Effective immediately, the Wyoming State Geological Survey will remain open for business,
but is asking the public to use phone and email communications as much as possible.
Please contact the WSGS at 307-766-2286 or wsgs-info@wyo.gov
Thank you for your understanding and cooperation.

New   WSGS Publication Search                                          Text Size  A  A   Twitter Facebook YouTube Instagram Sign Up For Email Updates


Sapphire Pool thermal feature, Yellowstone National Park

The Yellowstone hot spot, a 16-million-year-old volcanic system covering southeastern Oregon, southern Idaho, southwestern Montana, and northwestern Wyoming, is one of Earth’s largest silica-rich volcanic systems.

In northwestern Wyoming, the Yellowstone volcanic system is a large, Pleistocene, silicic volcanic field that is distinguished by three large calderas. There have been three major eruptions at Yellowstone in the past 2.1 million years. The last major eruption occurred 640,000 years ago and formed the Yellowstone caldera. Since that time there have been approximately 80 smaller eruptions, such as lava flows. The youngest of these ranges from 70,000 to 160,000 years old.

Additional Information:

Link to interactive oil and gas map

Seth Wittke (307) 766-2286 Ext. 244