| details |
Westphalian |
|
England |
Florin,R. On the morphology of the pollen grains in some Palaeozoic Pteridosperms. |
1937 |
| details |
Nd |
|
Nd |
Potonie,R. Position of the Paleozoic spore genera in the natural system. |
1954 |
| details |
Westphalian |
|
England |
Potonie,R. Synopsis of the Sporae in situ. |
1962 |
| details |
Westphalian B |
|
England(Yorkshire) |
Brousmiche,C. Precision on the spores produced by some Sphenopterid ferns pertaining to genera Boweria, Kidston, Crossotheca zeiller, Disiopteris stur, Myriotheca zeiller and Urnatopteris kidston. |
1986 |
| details |
Carboniferous |
|
England |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |