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National Geologic Map Database

Geologic Unit: Yorktown

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 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 ([ ]).