USGS Visual Identifier
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Geologic Unit: Trenton

Usage:
Trenton Formation (MI,NY,VT)
Trenton Group (KY,MI,NY*,PA*,VT*,WV*,VA*)
Trenton Limestone (GA*,IL*,IN*,KY*,MI*,NY*,OH*,PA*,TN*,VA*,WV)
Trenton Limestone of Chickamauga Group (TN)
Trenton Member of Martinsburg Formation (VA)

Age:
Ordovician, Middle*
Ordovician, Late*












Geologic Province:
Appalachian basin*
New England province*
Michigan basin*
Illinois basin*
Cincinnati arch*









Areal Extent:
NY*
IL*
WV*
VT*
GA*
VA*
TN*
KY*
OH*
MI*
IN*
PA*
ME*
NJ*

Type Locality:
Trenton Falls, Oneida Co., NY (Vanuxem, 1838).

Subunits:
(alphabetically): Amsterdam Limestone (NY,VT), Antes Shale (PA,WV*), Canajoharie Shale (NY*), Chambersburg Limestone (WV), Chandler Falls Formation (MI), Cobourg Formation (NY), Coburn Fm (PA*), Cumberland Head Formation (NY,VT), Curdsville Limestone (KY), Denley Limestone (NY), Denmark Formation (NY), Dolly Ridge Formation (VA*,WV*), Edinburg Formation (WV), Eggleston Formation (WV), Glens Falls Limestone (NY*,VT*), Hathaway Formation (VT), Hillier Limestone (NY), Hortonville Slate (VT*), Iberville Formation, Kings Falls Limestone (NY), Kirkfield Formation (NY), Moccasin Limestone (WV), Napanee Limestone (NY), Nealmont Limestone (PA*,VA*,WV), Oranda Formation (WV), Orwell Limestone (VT*), Rockland Limestone (NY), Salona Formation (PA*), Selby Limestone (NY), Sherman Fall (NY), Shoreham Formation (NY,VT), Steuben Limestone (NY), Stony Point Shale (NY,VT), Sugar River Limestone (NY) of Trenton Group; Chandler Falls Member (MI), Groos Quarry Member (MI), Haymeadow Creek Member (MI) of Trenton Formation

Unit Name History:
Named (Vanuxem, 1838) [From GNC index card files; not synopsized].
Overview (Thompson, 1990).
Age modified (Ryder and others, 1992).
Revised; Age modified; Areal limits (Ryder, 1992a).
Age modified; Revised (Ryder, 1992b).
Overview in central NY (Baird and others, 1992).
OH Geol. Survey usage; Overview (Wickstrom and others, 1992).
Overview (Haynes, 1992).
Correlation with Utica Shale (Goldman and others, 1994).

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