Spore genus a
- Citations total:
- 2
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| original | Ludlovian | Downtonian | United Kingdom | Richardson,J.B. Some British Lower Devonian spore assemblages and their stratigraphic significance. | 1967 |
| original | Early Cenomanian | Maryland | Robbins,E.I. et al. Palynological and stratigraphic investigations of four deep wells in the Salisbury Embayment of the Atlantic Coastal Plain. | 1975 |