Usage:
Mandata Formation of Helderberg Group (MD*,PA*,WV*)
Mandata Shale of Helderberg Group (PA)
Mandata Member of Helderberg Formation (PA*)
Mandata Member of Old Port Formation (PA)
Mandata Shale Member of Helderberg Formation (MD)
Subunits:
Bald Hill Bentonite Bed C.
Geologic age:
Early Devonian*
Type section, locality, area and/or origin of name:
Type locality: on highway to Berrysburg, 0.25 mi south of Mandata (Bull Run of Millersburg topographic sheet), Northumberland Co., PA (Swartz, 1938).
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 ([ ]).