| original |
Rocklandian |
|
Canada(Ontario) |
Eller,E.R. Scolecodonts from the Trenton series (Ordovician) of Ontario, Quebec and New York. |
1945 |
| original |
Rocklandian |
|
New York |
Eller,E.R. Scolecodonts from the Trenton series (Ordovician) of Ontario, Quebec and New York. |
1945 |
| 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 |
|
North America |
Taugourdeau,P. Scolecodont dispersa |
1978 |