| details |
Caradocian |
Ashgillian |
Alaska(North Slope) |
Carter,C. et al. Ordovician and Silurian fossils in Well cores from North Slope of Alaska. |
1975 |
| details |
Caradocian |
Ashgillian |
Alaska(North Slope) |
Carter,C. et al. Ordovician and Silurian fossils in Well cores from North Slope of Alaska. |
1975 |
| details |
Caradocian |
Ashgillian |
Alaska(North Slope) |
Carter,C. et al. Ordovician and Silurian fossils in Well cores from North Slope of Alaska. |
1975 |
| details |
Caradocian |
Ashgillian |
Alaska(North Slope) |
Carter,C. et al. Ordovician and Silurian fossils in Well cores from North Slope of Alaska. |
1975 |
| details |
Caradocian |
Caradocian |
Finland |
Eisenack,A. The microfauna of the Ostseekalke. 1. Chitinozoa, Hystrichosphaeres. |
1965 |
| details |
Ashgillian |
|
USSR(Ukrainian SSR) |
Tsegelnyuk,P.D. Ordovician stratigraphy of the Southwestern Region of the Russian Platform |
1980 |
| details |
Ashgillian |
|
USSR(Ukrainian SSR) |
Tsegelnyuk,P.D. On the question of the history of the geological evolution of Volyno-Podolskaya in the Ordovician and Silurian |
1989 |
| details |
Ashgillian |
|
China(Kweichow) |
Qian,Z.-S. et al. Chitinozoans from the Wufeng Formation, (Ashgillian), of the Yangzi Region |
1989 |
| details |
Ashgillian |
|
Russia(Siberia) |
Sennikov,N.V. et al. Synthesis of the graptolite and chitinozoan scales for the Altai-Salair Ordovician Basin (Siberia, Russia). |
2003 |
| details |
Arenigian |
|
China(Yunnan) |
Hou,J.-P. et al. Chitinozoan biostratigraphy in China |
1982 |