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Geology --- Geology, Stratigraphic --- Sedimentary rocks --- Sedimentation and deposition --- From 310 to 345 million years ago --- United States
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Ammonoidea --- Paleontology --- From 190 to 230 million years ago --- Alaska.
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Geology --- Geology, Stratigraphic --- Mollusks, Fossil. --- Paleontology --- From 190 to 230 million years ago --- Nevada
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