Usage:
Leesburg Member of Balls Bluff Siltstone (MD*,VA*)
Geologic age:
Triassic, Late*
Norian, middle*
Norian, late*
Type section, locality, area and/or origin of name:
Type section: southeastern cuts at junction of U.S. Route 15 bypass and entrance road to Balls Bluff National Cemetery, Waterford quadrangle, Loudoun Co., northern VA. Named from exposures near Leesburg, Loudoun Co., northern VA (Lee, 1977).
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 ([ ]).