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Ordovician Rocks in North America Today

Explore: the Ordovician in
or world paleogeography of the
While geologic activity has removed or covered up many Ordovician rocks, they can be found below the surface in many states, and are exposed in places like the Great Basin (Nevada and Utah), the Rocky and Appalachian Mountains, New England, the Great Lake States from Ohio to Minnesota, and in many other states. Ordovician rocks also occur in many Canadian provinces and in a few areas in northwestern Mexico.

View modern exposures of rock from
each time period in North America:

Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Precambrian

Ordovician Fossils
Fossil photos from Ordovician

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