The Paleontology of North America

The Ordovician in Southwest region, Mexico

 map

undifferentiated rock units

See exposures in this state from the:

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

Ordovician Fossils

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Paleontology and geology

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