Usage:
/Hollofield Layered Ultramafite of /Baltimore Mafic Complex (MD)
[Use of simple lithic terms is preferred (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Baltimore preoccupied. Name formally applied to Baltimore Gneiss by Williams and Darton (1892) in same area.]
Geologic age:
Cambrian(?)
Type section, locality, area and/or origin of name:
Exposures at abandoned Hollofield quarry along east bank of Patapsco River, 80 m south of first bridge crossing the Patapsco north of U.S. Interstate Highway I-70, Ellicott City quadrangle, Howard Co., MD (Crowley, 1976).
AAPG geologic province:
Piedmont-Blue Ridge province
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 ([ ]).