| original |
Trentonian |
|
Canada(Ontario) |
Eller,E.R. Scolecodonts from the Trenton series (Ordovician) of Ontario, Quebec and New York. |
1945 |
| original |
Trentonian |
|
New York |
Eller,E.R. Scolecodonts from the Trenton series (Ordovician) of Ontario, Quebec and New York. |
1945 |
| details |
Middle Ordovician |
|
North America |
Taugourdeau,P. Scolecodont dispersa |
1978 |
| details |
Late Tremadocian |
Early Arenigian |
Canada(Newfoundland) |
Underhay,N.K. et al. Lower Ordovician scolecodonts from the Cow Head Group, Western Newfoundland. |
1995 |