Category:Silurian metamorphic rocks in Pennsylvania

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Precambrian Phanerozoic metamorphic rocks in Pennsylvania
Preceded by Proterozoic Eon
Paleozoic Era Mesozoic Era Cenozoic Era
Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene 4ry
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