Usage:
Kirkwood Formation (DE*,MD*,NJ*,PA*)
Subunits:
(alphabetical): Alloway Clay Member (DE*,MD*,NJ*), Asbury Park Member (NJ*), Belleplain Member (NJ*), Grenloch Sand Member (NJ*), Shiloh Marl Member (NJ*), Wildwood Member (NJ*).
Geologic age:
late Tertiary (Miocene)*
Type section, locality, area and/or origin of name:
Type area: Kirkwood, Camden Co., west-central NJ (Knapp, 1904).
AAPG geologic province:
Atlantic Coast 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 ([ ]).