| details |
Middle Pliocene |
|
USSR(Voronezh) |
M¤dler,K.A. Azolla of the Quaternary and Tertiary and its significance for the taxonomy of older spores |
1954 |
| details |
Recent |
|
India(Orissa) |
Pant,D.D. et al. Structural studies on Lower Gondwana megaspores.Part 1. Specimens from Talchir Coalfield, India. |
1961 |
| details |
Pleistocene |
Recent |
Canada(British Columbia) |
Hills,L.V. et al. Azolla primaeva and its phylogenetic significance. |
1967 |
| details |
Paleocene |
|
Nd |
Martin,A.R.H. Somestructures in Azolla megaspores, and an anomalous Form. |
1976 |
| details |
Early Miocene |
|
Czechoslovakia(Bohemia) |
Buzek,C. et al. Azolla remains from the Lower Miocene of the North-Bohemian Bas Czechoslovakia |
1988 |
| details |
Piacenzian |
|
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Nd |
|
Nd |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Quaternary |
|
China(Chekiang) |
Kedves,M. Tranmission Electron Microscopy of the Fossil Spores. |
1996 |