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current23:05, 24 August 2008Thumbnail for version as of 23:05, 24 August 20081,400 × 883 (839 KB)Leaflet{{Information |Description={{en|1=Arikaree sandstone on Brule clay, in Pawnee Buttes, strong unconformity due to erosion; typical beds of concretions in Arikaree formation. Weld County, Colorado (Circa 1900).}} |Source=U.S. Geological Survey Professional

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