National Natural Landmarks

Cassia Silent City of Rocks

Cassia Silent City of Rocks
Cassia Silent City of Rocks

Cassia Silent City of Rocks contains monolithic landforms created by exfoliation processes on exposed massive granite plutons. It is the best example of bornhardts (weather-resistant rock left standing after erosion of surrounding rock) in the country.

Location: Cassia County, ID

Year designated: 1974

Acres: 20,214

Ownership: Federal, State, Private




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