Usage:
Yorktown Formation of Chesapeake Group (VA*,MD*,NC*)
Yorktown Formation (SC*)
Subunits:
(alphabetical): Moore House Member (VA*), Morgarts Beach Member (NC*,VA*), Rushmere Member (NC*,VA*), Sunken Meadow Member (NC*,VA*), Tunnels Mill Member (MD*,VA*).
Geologic age:
Tertiary*
Pliocene*
Quaternary
Pleistocene
Type section, locality, area and/or origin of name:
Yorktown, southwest side of York River, York Co., eastern VA (Clark and Miller, 1906).
Lectostratotype: 0.7 km east of Rushmere, right bank of James River, Bacons Castle 7.5-min quadrangle, Isle of Wight Co., eastern VA (Ward and Blackwelder, 1980).
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 ([ ]).