Paleozoic rocks at Stephen's Isle, central Grand Canyon. The bottom ledge is Tapeats Sandstone, representing an ancient beach, overlain by slope-forming Bright Angel Shale and Muav Limestone, with cliff-forming Redwall Limestone (contains corals) at the top on the right. All four formations contain marine fossils. What changes in the environment could account for this sequence of rocks?
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Paleozoic rocks at Stephen's Isle, central Grand Canyon. The bottom ledge is Tapeats Sandstone, repr...
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