while hiking in the grand canyon of northern arizona, you stop and observe an outcrop that exposes three different sedimentary rock types. on the bottom is a layer of shale, which is overlain by a layer of limestone, which is in turn overlain by a layer of sandstone. this stratigraphic sequence indicates a or a in sea-level occurred in this location in the past.
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while hiking in the grand canyon of northern arizona, you stop and observe an outcrop that exposes t...
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