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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.

Image 258342 is a 540 by 702 pixel JPEG
Uploaded: Feb10 22

Last Modified: 2022-02-10 15:23:12
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