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The Geology of the Paleozoic Era 7% of Earthâs history Permian Pennsylvanian Mississippian Devonian Silurian Ordovician Cambrian Boundaries are changes in the fossil record…
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The Geology of the Paleozoic Era 7% of Earthâs history Permian Pennsylvanian Mississippian Devonian Silurian Ordovician Cambrian Boundaries are changes in the fossil record…