U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Helderberg

Usage:

Helderberg Group (MD*,NJ*,NY*,PA*,VA*,WV*)
Helderberg Limestone (KY,MD*,OH*,PA*,VA*,WV*)
Helderberg Formation (MD,PA*)


Subunits:

GROUP STATUS (alphabetical): Alsen Limestone (NY*) or Alsen Formation (NY,NJ), Becraft Limestone (NY*,PA*,VA*,NJ*) or Becraft Formation (NY) or Becraft Sandstone (VA*), Coeymans Formation (NJ*,NY*,PA*) or Coeymans Limestone (NJ*,NY*,PA*,VA*,WV*), Corriganville Limestone (MD,NY,PA,VA,WV), [?]Dayville Limestone (NY), [?]Deansboro Limestone (NY), Elbow Ridge Sandstone (WV), [?]Jamesville Limestone (NY), Kalkberg Limestone (NJ*,NY*,PA*), Keyser Limestone (MD*,PA,VA*,WV*), Licking Creek Limestone (PA,VA*,WV*,MD*), Mandata Formation (PA*,MD*,WV*) or Mandata Shale (PA), Manlius Limestone (NJ*,NY*,PA*), Minisink Limestone (NJ*,NY,PA*), New Creek Limestone (MD*,PA,VA*,WV*), New Scotland Formation (NJ*,NY*,PA*,VA) or New Scotland Limestone (NJ,NY*,VA*,WV*), Olney Limestone (NY), Port Ewen Formation (NY*) or Port Ewen Limestone (NY*,PA*,VA,WV) or Port Ewen Shale (NJ*,NY,PA*), Port Jervis Limestone (MD,NY,PA,VA,WV), Rocky Gap Sandstone (VA,WV), Saltville Chert (VA), Shriver Formation (WV).

FORMATION STATUS (alphabetical): Becraft Member (MD,VA), Coeymans Limestone Member (MD,PA*) or Coeymans Member (PA*,VA), Elbow Ridge Sandstone Member (MD), Licking Creek Limestone Member (MD), Mandata Member (PA*) or Mandata Shale Member (MD), New Creek Limestone Member (MD), New Scotland Limestone Member (MD,PA*).


Geologic age:

Late Silurian to Early Devonian*


Type section, locality, area and/or origin of name:

Basal part of Helderberg Mountains, Albany Co., east-central NY (Conrad, 1839).


AAPG geologic province:

Appalachian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).