| details |
Silurian |
|
USSR(Siberia) |
Tesakov,Y.I. Key Beds of the Kureyka River Region. (In: Silur Sibirskoy Platformy;Opornyve Razezy Severo-Zapada Sibirskoy Platformy. B.S.Sokolov et al, editor) |
1980 |
| details |
Ordovician |
|
Poland |
Corradini,D. et al. Ultrastructure of some fossil and recent polychaete jaws, (scolecodonts). |
1974 |
| details |
Ordovician |
|
Poland |
Kozlowski,R. Some ornamentation on Masticatory of Ordovician Annelides Polychete |
1956 |
| original |
Middle Ordovician |
|
Poland |
Kielan-Jaworowska,Z. Polychaete jaw apparatuses from the Ordovician and Silurian of Poland and a comparison with modern forms. |
1966 |
| details |
Middle Gothlandian |
|
USSR(Siberia) |
Lopushinskaya,T.V. et al. The Ordovician and Silurian of the Noginsk area of the Siberian Platform |
1983 |
| details |
Llandoverian |
Wenlockian |
USSR(Siberia) |
Myannil,R.M. et al. Silurian polychaetes from northern Siberia |
1985 |
| details |
Late Tremadocian |
Early Arenigian |
Canada(Newfoundland) |
Underhay,N.K. et al. Lower Ordovician scolecodonts from the Cow Head Group, Western Newfoundland. |
1995 |