| details |
Kohlen Kalk |
|
Germany |
Kubart,B. Untersuchungen uber die flora des ostrau karweiner kohlenbeckens.I. die spora von spencerites membranaceous n.sp. |
1910 |
| details |
Westphalian A |
|
England |
Potonie,R. Synopsis of the Sporae in situ. |
1962 |
| details |
Desmoinesian |
|
Kansas |
Leisman,G.A. A Spencerites sporangium and associated spores from Kansas. |
1962 |
| details |
Middle Pennsylvanian |
|
Kansas |
Leisman,G.A. et al. Further occurrences of Spencerites from the Middle Pennsylvanian of Kansas and Illinois. |
1967 |
| details |
Carboniferous |
|
Nd |
Bharadwaj,D.C. et al. Suggestions for a morphological classification of sporae dispersae. |
1968 |
| details |
Nd |
|
Nd |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |