Usage:
Choptank Formation of Chesapeake Group (DE,MD*,VA*)
Subunits:
(alphabetical): Boston Cliffs Member (MD*,VA*), Conoy Member (MD*,VA*), Drumcliff Member (MD*,VA*), St. Leonard Member (MD*,VA*).
Geologic age:
Tertiary*
Miocene, late
Miocene, middle*
Type section, locality, area and/or origin of name:
Exposures on Choptank River, a short distance below Dover Bridge, Talbot Co., eastern MD (Eastern Shore) (Shattuck, 1902).
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 ([ ]).