Guelph Formation
The Guelph Formation is a geologic formation in New York and in Ontario, Canada. It preserves fossils dating back to the Silurian period.
Fossils
Fossils within the formation include:- Pentamerus occidentalis
- Megalomus canadensis
- Murchisonia bivittata
- M. macrospira
- M. boydii
- M. logani
- M. longispira
- M. uvittata
- M. turritiformis
- M. tullia
- Subulites ventricosus
- Pleurotomaria solaroides
- P. elora
- P. galtensis
- P. mora
- Cyclonema sulcata
- C. galtensis
- C. thysbe
- C. psyche
- C. depressa
- Holopea guelphensis
- Bellerophon angustata
- Favosites gothlandica
- F. polymorpha
- Halysites catenulatus
- Columnaria galtensis
- Obolus sp.
- Orikoceras sp.
- Orthoceras darwini
- Cyrtoceras arcticameratum
- C. Jonesi
- Phragmoceras hector
- Calymene blumenbachii
- Diphyphyllum irregulare
- Amplexus laxatus
- Rhynchonella sp.
- ''Athyris sp.''