| original |
Middle Cambrian |
|
USSR(Kazakh SSR) |
Grishina,T.S. et al. Middle Cambrian microphytofossils acritarchs, from the Chingiz Range. (In: Biostratigraphy and paleontology of the Lower and Middle Cambrian of northern Asia) |
1983 |
| details |
Middle Cambrian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Middle Cambrian |
|
USSR(Kazakh SSR) |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |