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Formations (Geology) --- Colorado. --- Montana. --- Wyoming.
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Earthquakes --- Paleontology --- Mollusks, Fossil. --- Montana.
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Formations (Geology) --- Geology. --- Colorado. --- Montana. --- Wyoming.
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Earthquakes --- Paleontology --- Mollusks, Fossil. --- Earthquakes. --- Geology. --- Tertiary Geologic Period. --- Montana.
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