A map of the American southwest showing deposits of the fertile "Blackland prairie dirt". An arrow points to a distinct curved occurrence of this material that is where the old coastline would have been during the Cretaceous period Originally uploaded in Teach the Earth:GeoContext.
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Last Modified: 2022-02-10 15:23:12 Permanent URL: https://serc.carleton.edu/download/images/258342/map_showing_belt_blackland_prairie_dirt_through_mississippi_alamaba.jpg
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