The Ordovician in Montana, US |
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Paleontology and geologyAfter an early episode of erosion, shallow seas flooded the state. Tectonic activity created a basin to the east, and the sea encroached from the southwest. These warm marine waters supported a diversity of algae, crinoids, bryozoans, brachiopods, and corals. Remnants of some of the earliest vertebrates also occur. |
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