Usage:
Tunnels Mill Member of Yorktown Formation of Chesapeake Group (MD*,VA*)
Geologic age:
Tertiary*
Pliocene, middle*
Type section, locality, area and/or origin of name:
Type section (subsurface): borehole H-22, at the junction of county roads 693 and 706, about 0.6 mi (1 km) southwest of Tunnels Mill, Accomack Co., VA (Mixon, 1985).
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 ([ ]).