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...
| Hauptverfasser: | , |
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| Format: | Journal article |
| Sprache: | English |
| Veröffentlicht: |
1991
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