Protohaploxypinus sp.C
- Citations total:
- 2
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| original | Guadalupian | Oklahoma | Morgan,B.E. Palynology of a portion of the El Reno Group (Permian) of Southwest Oklahoma. | 1967 | |
| original | Stephanian B | Stephanian C | USA | Clendening,J.A. Sporological evidence on the geological age of the Dunkard strata in the Appalachian Basin. | 1970 |