Some Upper Cretaceous ammonites from the Nacatoch Sand of Hempstead County, Arkansas

Some Upper Cretaceous ammonites from the Nacatoch Sand of Hempstead County, Arkansas

Richly fossiliferous concretions from the middle, glauconitic member of the Nacatoch Sand of southwestern Arkansas include an ammonite assemblage here referred to as the Nostoceras (Nostoceras) rugosum zone. The index species is abundant, accompanied by Solenoceras texanum (Shumard, 1861), S. nitidu...

書目詳細資料
Main Authors:	Cobban, W, Kennedy, W
格式:	Journal article
語言:	English
出版:	1991

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