Usage:
Mountain Run Member of Tibbstown Formation (VA*)
Geologic age:
Triassic, Late*
Norian*
Type section, locality, area and/or origin of name:
Type section: Exposures on the east bank of Mountain Run, 640 m (2,100 ft) southeast of the bridge over the Southern Railroad on Virginia State Road 3, Culpeper East quadrangle, Culpeper Co., VA (Lee and Froelich, 1989).
AAPG geologic province:
Piedmont-Blue Ridge province*
Culpeper 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 ([ ]).