| original |
Early Pennsylvanian |
|
Michigan |
Arnold,C.A. Megaspores from the Michigan Coal Basin. |
1950 |
| details |
Nd |
|
Nd |
Pi©rart,P. The evolution of the megaspores. |
1961 |
| details |
Nd |
|
Nd |
Loboziak,S. The micro and megaspores of the western part of the Bassin Houiller of northern France, stratigraphic applicationsin the study of several boreholes. |
1969 |
| details |
Nd |
|
Nd |
Loboziak,S. The micro and megaspores of the western part of the northern Coal Basin of France. |
1971 |
| details |
Westphalian A |
Westphalian D |
Michigan |
Braman,D.R. et al. The stratigraphic and geographic distribution of Carboniferous megaspores. |
1980 |
| details |
Nd |
|
Nd |
Hemsley,A.R. et al. Caudatosporites, gen.nov. A reappraisal of an anomalous Carboniferous Lycopod seed-megaspore with reference to exine ultrastructure. |
1991 |
| details |
Nd |
|
Nd |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |