Usage:
Beekmantown Dolomite (NY*,PA*,VA*,WV)
Beekmantown Limestone (MD*,NY*,PA*,VA*)
Beekmantown Shale (NY*,VT*)
Beekmantown Formation (VA*)
Beekmantown Formation of Knox Group (VA*)
Beekmantown Dolomite of Knox Group (KY*,VA*,WV)
Beekmantown Group (MD*,NJ*,NY*,PA*,VT*,VA*,WV*)
Beekmantown Group of Kittatinny Supergroup (NJ*,PA*)
Beekmantown Group [undivided] (OH*-subsurface)
Beekmantown dolomite (informal) (OH*-subsurface)
For informal usage, the rank or lithologic term should not be capitalized.
Subunits:
GROUP STATUS (alphabetical): Axemann Limestone (PA*), Axemann Formation (PA), Bascom Formation (VT*), Beldens Formation (VT*), Bellefonte Dolomite (PA*), Bellefonte Formation (PA), Bridport Dolomite (NY), Chepultepec Dolomite (TN,OH,KY), Chipman Formation (VT*), Chuctanunda Creek (NY), Cutting Dolomite (VT*), Cutting Formation (VT), Epler Formation (PA*,NJ*), Fort Ann Formation NY), Fort Cassin Formation (VT,NY), Great Meadow Formation (NY), Hastings Creek Limestone (VT), Highgate Formation (VT), Larke Dolomite (PA*,NY), Larke Formation (PA,WV), Luke Hill Limestone (VT), Morgan Corners Formation (VT), Naylor Ledge Limestone (VT), Nittany Dolomite (PA*,MD*), Ogdensburg Dolomite (NY), Ontelaunee Formation (PA*), Pinesburg Station Dolomite (MD*,VA*,WV*), Pinesburg Station Formation (PA*), Potsdam Sandstone (NY), Providence Island Dolomite (VT), Rickenbach Dolomite (NJ*,PA*), Rickenbach Formation (NJ,PA), Rockdale Run Formation (MD*,PA*,VA*,WV*), Rose Run Sandstone (OH), Shelburne Formation (VT*), Spellman Formation (NY), Stonehenge Limestone (PA*,MD*,VA*,WV*,NJ*,NY*), Stonehenge Formation (PA*,NJ*,NY*), Stoufferstown Formation (PA), Strites Pond Formation (VT), Tribes Hill Formation (NY), Wallace Creek Formation (VT), Whitehall Formation (NY,VT), Whitehall Dolostone (VT).
FORMATION STATUS (alphabetical) --all in VA: Chepultepec Dolomite Member, Kingsport Dolomite Member, Longview Dolomite Member, Mascot Dolomite Member.
Geologic age:
Early to Middle Ordovician*; locally Late Cambrian*
Type section, locality, area and/or origin of name:
Named from exposures at Beekmantown, Clinton Co., northeast corner of NY (US geologic names lexicons, USGS Bull. 896, 1200).
Reference section: begins at top of group in Potomac River bluff, about 1,000 ft west of intersection with southwest face of Pinesburg Station quarry, and continues westward along C&O Canal for 1 mi, Washington Co., MD (Sando, 1956).
AAPG geologic province:
Appalachian basin*
New England province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).