| details |
Late Callovian |
|
England |
Erkmen,U. et al. Dinoflagellate cysts, acritarchs and tasmanitids from the uppermost Callovian of England and Scotland: With a reconsideration.
of the "Xanthidium pilosum" problem. |
1980 |
| details |
Late Callovian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Middle Jurassic |
|
England |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |