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National Geologic Map Database

Geologic Unit: Mandata

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).