| details |
Late Caradocian |
|
Algeria |
Oulebsir,L. et al. Ordovician chitinozoa from Algeria: Biostratigraphy and paleogeography |
1995 |
| details |
Late Caradocian |
|
Baltic |
Paris,F. et al. A revised chitinozoan classification |
1999 |
| details |
Late Caradocian |
|
Saudi Arabia |
Al-Hajri,S. et al. Sub-surface palynostratigraphy of the Palaeozoic of Saudi Arabia. |
2000 |
| details |
Late Caradocian |
Early Ashgillian |
Saudi Arabia |
Paris,F. et al. Ordovician chitinozoans from central Saudi Arabia. |
2000 |
| details |
Caradocian |
|
Scotland(Dumfries) |
Zalasiewicz,J. et al. Submission of Hartfell Score (south Scotland) as a GSSP for the base of the middle stage of the Upper Ordovician Series. |
2004 |