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National Geologic Map Database

Geologic Unit: Hamilton

Usage:

Hamilton Group (MD*,NY*,OH*,PA*,VA*,WV*)
Hamilton Formation (NJ,PA*,VA*,WV*)
Hamilton Shale (NY,PA*)
Hamilton Shale Member of Romney Formation (MD)


Subunits:

(ascending) Marcellus Shale (MD*,NY*,OH*,PA*,VA*,WV*), Skaneateles Shale (MD*,NY*,OH*,PA*,WV*), Ludlowville Shale (MD*,NY*,OH*,WV*), and Moscow Shale (MD*,NY*,PA*,WV*); Mount Marion Formation (NY*)


Geologic age:

Middle Devonian*


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

West Hamilton and Hamilton, Madison Co., NY (Vanuxem, 1840).


AAPG geologic province:

Appalachian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).