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Welcome to the Wyoming State Geological Survey

Interpreting the past, providing for the future

Lance and Fort Union Formations Study

New research helps define extent of coal-bearing strata and potential natural gas reservoir rock in the Great Divide Basin.

Wyoming Cultural Geology Guide

This new guide shows readers how geology has influenced Wyoming's cultural landscape.

Geologic Maps

Bedrock and surficial geologic maps can be downloaded free of charge. The index maps on this page will help you locate mapped areas.

Oil and Gas Basins

Learn about the geology of Wyoming's oil and gas basins on this page.

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State Dinosaur—Triceratops

State Fossil—Knightia

State Gemstone—Jade