| details |
Nd |
|
Nd |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Cenomanian |
|
Nd |
Srivastava,S.K. Cretaceous spore-pollen floras |
1978 |
| details |
Nd |
|
Nd |
Hall,J.W. et al. Megaspore assemblages in the Cretaceous of Minnesota. |
1968 |
| details |
Nd |
|
Nd |
Ellis,C.H. et al. The Cretaceous megaspore genus Arcellites, Miner. |
1964 |
| details |
Late Cretaceous |
|
Iowa |
Potter,D.E. An emendation of the sporomorph Arcellites Miner,1935 |
1963 |
| original |
Late Cretaceous |
|
Iowa |
Schemel,M.P. Cretaceous plant microfossils from Iowa |
1950 |