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National Geologic Map Database

Geologic Unit: Merced

Usage:

Merced Formation (CA*)


Geologic age:

late Tertiary to Quaternary (Pliocene to Pleistocene)*


Type section, locality, area and/or origin of name:

Named from Lake Merced, which lies in structural or synclinal depression of Pliocene terrane, south of San Francisco, [San Francisco Co.], western CA. Exposed in sea-cliff which extends from Lake Merced, near San Francisco, to Mussel Rock about 8 mi south of Point Lobos at entrance to the gate (Lawson, 1893).


AAPG geologic province:

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