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Topo

Rock Formations

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Topo

Ecoregions

Public Lands

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Temperature

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Sedimentary rocks (Devonian to Ordovician). (IDDSOs;0)

Geologic Formation in ID, MT

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Lithology

Dolostone

Limestone

Sandstone

Other (862 mi²)

Geologic Age

Ordovician – Devonian (487.3 Ma – 359.3 Ma ago)

Geologic Unit Label

DSOs

Marine dolostone and limestone and sandstone in east-central and southeastern Idaho (Summerhouse, Kinnikinic, and Swan Peak sandstones, Fish Haven, Laketown, Jefferson, Three Forks, and Darby formations) and deep-water carbonaceous mudrocks of Phi Kappa, Trail Creek, and Milligen formations east of Ketchum. (Paleocene to Neoproterozoic Sedimentary and Igneous Rocks of the Cordilleran System).

— USGS

Taxonomy

Classified As

Geologic Formation