Upper Cretaceous (Maastrichtian) ammonites from the Nostoceras alternatum zone in southwestern Arkansas
Calcareous concretions in the Nacatoch Sand in Hempstead County, Arkansas, yield abundant fossils of the lower Maastrichtian Nostoceras alternatum zone, previously recognized in Mississippi, Alabama, and Georgia. The fossils include Inoceramus regularis d'Orbigny, 1842, Pseudophyllites indra (F...
| Autores principales: | , |
|---|---|
| Formato: | Journal article |
| Lenguaje: | English |
| Publicado: |
1991
|