| Guelph Formation | |
|---|---|
| Stratigraphic range: Silurian | |
 Stromatolite from the Guelph Formation | |
| Type | Sedimentary |
| Underlies | Vernon, Lockport Group |
| Overlies | Eramosa Member |
| Thickness | 160 feet[1] |
| Lithology | |
| Primary | Dolomite |
| Location | |
| Region |  New York |
| Country |  United States |
| Type section | |
| Named for | Guelph, Ontario |
| Named by | William Edmond Logan[1] |
The Guelph Formation is a geologic formation in New York and in Ontario, Canada. It preserves fossils dating back to the Silurian period.[2]
Fossils
Fossils within the formation include:[1]
- Pentamerus occidentalis (Hall)
- Megalomus canadensis (Hall)
- Murchisonia bivittata (Hall)
- M. macrospira (Hall)
- M. boydii (Hall)
- M. logani
- M. longispira
- M. uvittata
- M. turritiformis
- M. tullia
- Subulites ventricosus (Hall)
- Pleurotomaria solaroides (Hall)
- P. elora (Billings)
- P. galtensis (Billings)
- P. mora
- Cyclonema sulcata (Hall)
- C. galtensis
- C. thysbe
- C. psyche
- C. depressa
- Holopea guelphensis (Billings)
- Bellerophon angustata (Hall)
- 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.
References
- 1 2 3 Logan, W.E., Murray, A., Hunt, T.S., and Billings, E., 1863. Geology of Canada. Report of Progress from its Commencement to 1863; Geological Survey of Canada, 983 p. [accompanied by an Atlas of Maps and Sections.] doi:10.4095/123563
- ↑ Guelph, USGS, National Geologic Map Database, Geolex — Unit Summary
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