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The Cincinnati Museum of Natural History museum is a part of a larger center in downtown Cincinnati that includes:   A way cool online exhibit is called "Cincinnati Under the Sea" which describes the area from the Ordovician time period. The amazing diversity of organisms preserved in our local rocks is the result of the “Great Ordovician Biodiversification Event”, one of the largest evolutionary events in the history of life on Earth.   This .pdf from the geology society goes into more details on this event. This short video describes the gist of this remarkable time frame.