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Fil:Chalk (Niobrara Formation, Upper Cretaceous; bluffs south of Castle Rock, Gove County, Kansas, USA) 5 (27371440129).jpg

flickr.com/photos/jsjgeology/27371440129/ operator: Flickr URL: https://live.staticflickr.com/4640/27371440129_94722e3909_o.jpg determination method: SHA-1...

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