44°36′N 81°06′W / 44.6°N 81.1°W
| Eramosa (member) | |
|---|---|
| Stratigraphic range: Silurian Wenlockian ~ | |
| Type | Member |
| Unit of | Lockport Group |
| Underlies | Guelph Formation |
| Overlies | Goat Island Formation |
| Lithology | |
| Primary | Dolomite (rock), Limestone |
| Location | |
| Region | |
| Country |  United States Canada |
| Type section | |
| Named for | Eramosa River |
The Eramosa Member is a Silurian stratigraphic unit of the Lockport Formation exposed along the Niagara Escarpment in Ontario and western New York State. In the late nineteenth century it was an important source of building stone in Hamilton, Ancaster and Waterdown,[1] and in the late twentieth century quarries in a similar unit, also called the Eramosa, near Wiarton in the Bruce Peninsula, became an important source of dimension stone at a time when most of the other resources of similar stone were depleted. Work in these quarries led to the discovery of exceptionally well preserved fossils (the Eramosa lagerstätte). On the east Mountain at Hamilton, a well-developed cave system was discovered in the Eramosa and has now been designated as the Eramosa Karst Conservation Area.[2]
- ^ Middleton, Gerard V. (23 August 2011). "Hamilton Building Stone, Part 2: Eramosa Dolomite". Raise the Hammer. Retrieved 23 September 2022.
- ^ "Eramosa Karst - Hamilton Conservation Authority". Archived from the original on 30 September 2011. Retrieved 18 October 2011.