| original |
Middle Cambrian |
|
USSR(Leningrad) |
German,T.N. et al. Veryhachium of the Cambrian. (In:Mikrofitofossilii Proterozoya i Rannego Paleozoya SSSR. B.V.Timofeev, editor) |
1974 |
| details |
Cambrian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Early Cambrian |
|
USSR |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |
| details |
Nd |
|
Nd |
Fatka,O. et al. The Ordovician acritarch Frankea: some critical remarks |
1997 |
| details |
Nd |
|
Nd |
Fatka,O. et al. The Ordovician acritarch Frankea: some critical remarks |
1997 |