Graptolites
- Citations total:
- 2
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| details | Middle Ordovician | Late Ordovician | Ohio | Schopf,J.M. et al. Acid-resistant microfossils from the Cynthiana Formation and Eden Group. | 1961 |
| details | Middle Ordovician | Late Ordovician | Kentucky | Schopf,J.M. et al. Acid-resistant microfossils from the Cynthiana Formation and Eden Group. | 1961 |