USGS Visual Identifier
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Geologic Unit: Utica

Usage:
Utica Shale (NY*,MI*,PA*,IN*,OH*)
Utica Formation (PA)

Age:
Ordovician, Middle*
Mohawkian*
Kirkfieldian
Shermanian
Ordovician, Late*
Cincinnatian*
Edenian*
Maysvillian*
Geologic Province:
Appalachian basin*
Michigan basin*
Cincinnati arch*





Areal Extent:
IN*
MI*
NY*
OH*
PA*




Type Locality:
Type area: well exposed in the Starch Factory Creek to the east of Utica. Named from City of Utica, Oneida Co., NY (Ruedemann, 1912).

Subunits:
Flat Creek Member (NY) and Indian Castle Member (NY).

Unit Name History:
Named (Emmons, 1842).
Overview (Ruedemann, 1925).
Utica divided into Nowadaga, Loyal Creek, and Holland Patent zones (Ruedemann and Chadwick, 1935) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given].
Overview (Kay, 1937; Wilmarth, 1938).
Revised (Berry, 1970) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given].
Areal limits; Overview (Bergstrom and Mitchell, 1990).
Areal limits; Age modified (Ryder, 1992).
Age modified (Ryder and others, 1992).
Members named, correlated, figure (Goldman and others, 1994).
Overview (Frey, 1995).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).






U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013