Usage:
Millboro Shale (MD,PA,VA*,WV*)
Millboro Member of Romney Shale (VA)
Millboro Member of Chattanooga Shale (TN)
Subunits:
Purcell Member (VA), Marcellus Member (VA), Naples Member (VA).
Geologic age:
Middle Devonian*
Type section, locality, area and/or origin of name:
Millboro Springs, Bath Co., VA (Butts, 1940).
AAPG geologic province:
Appalachian 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 ([ ]).