USGS Visual Identifier
National Geologic Map Database logo GEOLEX database


Geologic Unit: Frontenac

Usage:
Frontenac Formation (ME*,NH*,VT*)

Age:
Silurian(?)*
Wenlockian*
Ludlovian*
Pridolian(?)*
Geologic Province:
New England province*



Areal Extent:
ME*
NH*
VT*


Type Locality: (See Canadian Lexicon)
Type area: Mount Megantic, Frontenac Co., Quebec, Canada (McGerrigle, 1935).

Subunits:
Canada Falls Member (ME)

Unit Name History:
Named (H.W. McGerrigle, 1935, Quebec Bur. Mines, Rpt. Minister Mines 1934-35, pt. D, p. 71, 74-78) [From US geologic names lexicon, USGS Bull. 896; synopsis not included here].
Overview in ME (Marvinney, 1994).
Revised; Extended into VT; Age modified; Biostratigraphic dating; Isotopic dating (Moench and others, 1995).
NH State Geol. Map usage; Extended into NH; Age modified; Isotopic dating (Lyons and others, 1997).

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