original |
Early Ordovician |
|
China(Kweichow) |
Wang,X. et al. Early Ordovician chitinozoa from Wuchuan, Guizhou. |
1990 |
original |
Early Llandeilian |
|
Algeria |
Oulebsir,L. et al. Ordovician chitinozoa from Algeria: Biostratigraphy and paleogeography |
1995 |
original |
Late Ordovician |
|
Nevada |
Finney,S.C. et al. Late Ordovician mass extinction: A new perspective from stratigraphic sections in Central Nevada. |
1999 |
original |
Early Ashgillian |
|
Saudi Arabia |
Paris,F. et al. Ordovician chitinozoans from central Saudi Arabia. |
2000 |
original |
Middle Ordovician |
|
Australia(W.Australia) |
Winchester-Seeto,T. et al. The environmental response of Middle Ordovician large organic walled microfossils from the Goldwyer and Nita Formations, Canning Basin, Western Australia. |
2000 |