| 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 |
Early Ordovician |
Middle Ordovician |
Canada(Newfoundland) |
Jansa,L.F. Trace fossils from the Cambro-Ordovician Cow Head Group, Newfoundland, and their paleobathymetric implication. |
1974 |
| details |
Early Ordovician |
Middle Ordovician |
Canada(Newfoundland) |
Jansa,L.F. Trace fossils from the Cambro-Ordovician Cow Head Group, Newfoundland, and their paleobathymetric implication. |
1974 |
| details |
Middle Ordovician |
|
Europe |
Taugourdeau,P. Scolecodont dispersa |
1978 |
| details |
Nd |
|
Nd |
Edgar,D.R. Polychaetes of the Lower and Middle Paleozoic. A multi-element analysis and a phylogenetic outline. |
1984 |
| details |
Late Tremadocian |
Early Arenigian |
Canada(Newfoundland) |
Underhay,N.K. et al. Lower Ordovician scolecodonts from the Cow Head Group, Western Newfoundland. |
1995 |
| details |
Ordovician |
|
Poland |
Szaniawski,H. Scolecodonts. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |
| details |
Llandeilian |
Rakvere |
Estonia |
Hints,O. Late Viruan (Caradoc) polychaete jaws from North Estonia and the St. Petersburg region. |
1998 |
| details |
Llandeilian |
Rakvere |
Russia(St.Petersburg) |
Hints,O. Late Viruan (Caradoc) polychaete jaws from North Estonia and the St. Petersburg region. |
1998 |