| original |
Early Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoa from the Lower Arenig of the Levis Formation, (Quebec, Canada). |
1980 |
| details |
Late Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoans of the Upper Arenigian, (Zone D) of the Levis Formation, Quebec, Canada. |
1982 |
| details |
Arenigian |
|
USSR(Mountain Altai) |
Zaslavskaya,N.M. et al. Lower Ordovician chitinozoa of Gorny Altai. (In: Lower Ordovician stratigraphy and fauna of Upper Altai. A.V.Kanygin, editor) |
1984 |
| details |
Arenigian |
|
Australia(Queensland) |
Playford,G. et al. Chitinozoa from Lower Ordovician strata of the Georgina Basin, Queensland, (Australia). |
1988 |
| details |
Early Arenigian |
|
Canada(Quebec) |
Achab,A. Ordovician chitinozoan zonation of Quebec and Western Newfoundland. |
1989 |
| details |
Arenigian |
|
Canada(Arctic) |
Achab,A. et al. Ordovician chitinozoans from the Arctic Platform and the Franklinian Miogeosyncline in northern Canada |
1995 |
| details |
Arenigian |
|
China(Hopei) |
Wang,X et al. The Huanghuachang section, near Yichang, China, proposed as global stratotype for the base of the Middle Ordovician Series. |
2002 |
| details |
Middle Ordovician |
|
China(Hopei) |
Wang,X. et al. The Huanghuachang Section, potential as Global Stratotype for the base of the Middle Ordovician Series. (In: Ordovician from the Andes. G.L.Albanesi,M.S.Beresi,S.H.Peralta,editors) |
2003 |
| details |
Arenigian |
|
Russia(Siberia) |
Sennikov,N.V. et al. Synthesis of the graptolite and chitinozoan scales for the Altai-Salair Ordovician Basin (Siberia, Russia). |
2003 |