Triangulati
- Citations total:
- 2
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| original | Desmoinesian | Illinois | Schopf,J.M. Spores from the Herrin (No. 6) Coal Bed in Illinois. | 1938 | |
| details | Mississippian | Permian | Pennsylvania | Cross,A.T. et al. Representative microfossil floras of some Appalachian Coals | 1952 |