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zzza) During the Paleozoic Era (300 to 500 Mill Yrs Ago), Seas Covered the Region, Leaving Layers of Marine Sediment ...JPG
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%20During%20the%20Paleozoic%20Era%20(300%20to%20500%20Mill%20Yrs%20Ago)%2C%20Seas%20Covered%20the%20Region%2C%20Leaving%20Layers%20of%20Marine%20Sediment%20...JPG "zzza) During the Paleozoic Era (300 to 500 Mill Yrs Ago), Seas Covered the Region, Leaving Layers of Marine Sediment ...JPG")