The Paleontology of the midwest

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The Precambrian in Iowa, US

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See exposures in this state from the:
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Precambrian

Precambrian Fossils
Fossil photos from Precambrian in Iowa

Paleontology and geology

A small amount of Precambrian rock is exposed in the northwest corner of Iowa in Gitchie Manitou State Preserve. These reddish-colored rocks are the1.6-billion-year-old Sioux Quartzite, a metamorphic rock formed from nearly pure quartz sandstone. Other Precambrian-age rocks elsewhere across the state lie deeply buried beneath thousands of feet of sedimentary rocks. No fossils are known from these Precambrian rocks.

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