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Generalized Geologic Map of the Conterminous United States
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  The North American Tapestry of Time and Terrain

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Legend and Rock Ages
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  Legend and Rock Ages
 

Paleozoic Rocks - 540 to 248 million years ago

map of Paleozoic rocks

 

The Paleozoic era, sometimes called the Age of Fish, witnessed the proliferation of life in diverse forms across the planet. Animals and plants began to move out of the water and populate terrestrial environments . As the continents shifted around the globe, they had, by the end of the Paleozoic, combined to form the supercontinent Pangaea.

The Paleozoic can be divided into seven periods as follows (from youngest to oldest):

Permian
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian

Paleozoic rocks are found in a variety of features on the continent, including the Appalachian Valley and Ridge Province, exotic terranes, recessional moraines, the Grand Canyon, and the Basin and Range.