The Glens Falls formation is the lowest (oldest) unit of the Trenton Group. The Glens Falls is a made up of limestone and contains thin fossiliferous beds. It was most likely deposited in shallow water due to the presence of ripple marks.[1]
| Glens Falls | |
|---|---|
Stratigraphic range: | |
| Type | Formation |
| Unit of | Trenton Group |
| Sub-units |
|
| Overlies | Amsterdam Limestone |
| Lithology | |
| Primary | Limestone |
| Other | Shale |
| Location | |
| Region |  New York Ontario |
| Country | United States Canada |
| Type section | |
| Named for | Glens Falls, NY |
| Named by | (RUEDEMANN, 1912) |
Stratigraphy
editThe Shoreham member is the upper member of the formation. It contains much more clay and silica, resulting in beds of shale. Name after a quarry in Vermont.
The Larrabee Member is the lower member. It contains some clay in silica but has more carbonate material than the Shoreham. Name after a quarry in Vermont.[2]
Fossils
editEconomic Uses
editThe limestone in the Glens Falls has been used for agricultural lime, used as lime for cement manufacturing, and crushed aggregate for road beds.
References
edit- ^ "Geolex — GlensFalls publications". ngmdb.usgs.gov. Archived from the original on 2023-09-22. Retrieved 2023-09-15.
- ^ David A. MacLean FACIES RELATIONSHIPS WITHIN THE GLENS FALLS LIMESTONE OF VERMONT AND NEW YORK
- ^ Fisher, D.W., 1965a, Mohawk Valley Strata and structure; New York State Geological Association field guide, 37th Annual meeting, Union College