Usage:
Port Ewen Formation of Helderberg Group (NY*)
Port Ewen Limestone of Helderberg Group (NY*,PA*,VA,WV)
Port Ewen Shale of Helderberg Group (NJ*,NY,PA*)
Subunits:
(alphabetical) --all in NY: East Kingston Member, Lake Katrine Member.
Geologic age:
Early Devonian*
Type section, locality, area and/or origin of name:
Named from exposures in vicinity of Port Ewen, Ulster Co., NY (Clarke, 1903).
AAPG geologic province:
Appalachian basin*
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 ([ ]).