Geology of the USA

Geology of each of the 50 states in the United States, plus Washington DC and New York City.

Official State Rocks

Twenty-five states honor 17 different rocks as state rocks or state stones

Twenty-five states honor 17 different rocks as official emblems. See them all here.

The official state minerals of the United States, listed by state.

Nineteen states have named 17 different official minerals. See them here.

Thirty-five states have named official gemstones. Here they are, listed by state.

The 27 official gemstones of 35 states.

Of the 50 states, 38 have official state fossils or state dinosaurs (or both).

Geologist Peter Thompson describes the geology of the highest points of each state.

Explore the 591 U.S. National Natural Landmarks in this map from the National Park Service.

New York City and San Francisco, and their geologic blessings.

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