| Beekmantown Group | |
|---|---|
| Stratigraphic range: | |
_2_(28393169636).jpg.webp) Canyon passage in Skyline Caverns, Rockdale Run Formation, Beekmantown Group | |
| Type | Group |
| Overlies | Potsdam Sandstone |
| Lithology | |
| Primary | Dolomitic sandstones and carbonates |
| Location | |
| Region | Eastern North America |
| Country | United States, Canada |
The Beekmantown Group is a late Cambrian to lower–middle Ordovician geologic group that occurs in the eastern Canada (Québec) and northeastern United States,[2] datable from its conodont fauna. It contains dolomitic sandstones and carbonates from just off land from the palaeocoastline.[1]
The usage of the term is diverse and depends on the state or region in question, and the group encompasses different formations in different regions. In some states it is considered a formation rather than a group, but the lithology varies by region.[3]
See also
References
- 1 2 Salad Hersi, Osman (2012). "Biostratigraphic Constraints on Chronostratigraphic Intraformational Relationships within the Lower–Middle Ordovician Beekmantown Group, Laurentian Margin: Eastern Ontario and Southwestern Quebec, Canada". AAPG Memoir. 98: 559–574. doi:10.1306/13331507M983506.
- ↑ Hersi, O. S.; Lavoie, D.; Nowlan, G. S. (2003). "Reappraisal of the Beekmantown Group sedimentology and stratigraphy, Montréal area, southwestern Quebec: Implications for understanding the depositional evolution of the Lower-Middle Ordovician Laurentian passive margin of eastern Canada". Canadian Journal of Earth Sciences. 40 (2): 149. Bibcode:2003CaJES..40..149H. doi:10.1139/e02-077.
- ↑ Beekmantown Geologic Unit, Geolex — Unit Summary, National Geologic Map Database. USGS/AASG. Retrieved 2018-06-11.
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