| details |
Ordovician |
|
USSR(Mountain Altai) |
Naumenko,A.I. et al. Correlation of Ordovician deposits in the Erinat and Ulagan Trough |
1982 |
| details |
Early Gothlandian |
|
USSR(Yakut ASSR) |
Gutak,Y.M. On the time of formation of the Ulaganskaya Depression, Mount Altai. |
1984 |
| details |
Arenigian |
|
China(Shanghai) |
Hu,Y. Micropalaeoflora from the Early Ordovician in Gaoqiao Region of Shaanxi and its stratigraphic significance. |
1986 |
| details |
Middle Cambrian |
Early Ordovician |
USSR(Pre-Baltic) |
Hu,Y. Micropalaeoflora from the Early Ordovician in Gaoqiao Region of Shaanxi and its stratigraphic significance. |
1986 |
| details |
Middle Cambrian |
Early Ordovician |
USSR(Pre-Baltic) |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |