| details |
Middle Ordovician |
|
Canada(Quebec) |
Staplin,F.L. et al. Evaluation of some acritarchous Hystrichosphere genera. |
1965 |
| original |
Caradocian |
|
Canada(Quebec) |
Staplin,F.L. et al. Evaluation of some acritarchous Hystrichosphere genera. |
1965 |
| details |
Late Caradocian |
|
Czechoslovakia |
VavrdovЎ,M. Palaeozoic microplankton from central Bohemia. |
1966 |
| details |
Tremadocian |
|
USSR(Russian Platform) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| details |
Middle Ordovician |
|
Canada(Quebec) |
Loeblich,A.R.,Jr. et al. Some Middle and Late Ordovician microphytoplankton from Central North America. |
1978 |
| details |
Late Ordovician |
Early Gothlandian |
India(Karnataka) |
Viswanathiah,M.N. et al. Acritarchs and associated microplankton from the Katageri Formation of the Badami Group, South India. |
1984 |
| details |
Late Ordovician |
|
Canada(Atlantic Coast) |
Jacobson,S.R. Middle Ordovician acritarchs are guide fossils for the Upper Ordovician |
1987 |
| details |
Caradocian |
|
Canada(Quebec) |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |