| link
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From
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To
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Geolocation
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Author - title
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Year
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| details | Early Cretaceous | Maryland | Brenner,G.J. The spores and pollen of the Potomac Group of Maryland | 1963 | |
| details | Cenomanian | Minnesota | Brenner,G.J. The spores and pollen of the Potomac Group of Maryland | 1963 | |
| original | Albian | Nd | Brenner,G.J. The spores and pollen of the Potomac Group of Maryland | 1962 | |
| original | Cenomanian | Minnesota | Pierce,R.L. Lower Upper Cretaceous plant microfossils from Minnesota. | 1961 |