The Paleontology of North America

The Precambrian in Arkansas, US

 map
 

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 Arkansas

Paleontology and geology

There are no Precambrian rocks exposed at the surface in Arkansas. What we know about Arkansas’ Precambrian comes from drill cores and from the interpretation of geophysical evidence, such as deep seismic profiles. The presence of both extrusive igneous rocks (rhyolite) and intrusive igneous rocks (granite) tells us that there were active volcanoes in what is now northern Arkansas during the Precambrian, and that some of the magma that fueled these volcanoes never reached Earth’s surface. The magma that erupted formed the rhyolite, and the magma that cooled below the surface formed the granite.

Missouri State Map Tennessee  State Map Mississippi State Map Texas State Map Oklahoma State Map Louisiana State Map