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Geologic Unit: Eliot

Eliot Formation of Merrimack Group (ME*,MA*,NH*)


Geologic Province:
New England province*

Areal Extent:

Type Locality:
Eliot, York Co., southwestern ME (Katz, 1917).

Calef Member (NH*)

Unit Name History:
[Please note: only the Goldsmith and others (1982), Zen and others (1983), Hussey and Bothner (1993), and Lyons and others (1997) references include synopses here. The remaining references have yet to be added from the GNC index card files. Until then, feel free to contact us if you would like complete bibliographic citations.]
Named Eliot slate (Katz, 1917).
Revised to Eliot Formation in NH, Calef Member assigned (Freedman, 1950).
Assigned to Merrimack Group in NH; Age modified (Billings, 1955).
Age modified (Billings, 1956).
Assigned to Merrimack Group in ME (Hussey, 1968).
Extended into MA as part of Merrimack Group; Age modified (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Age modified (Osberg and others, 1985).
Areal limits (Hussey and Bothner, 1993).
NH State Geol. Map usage; Age modified (Lyons and others, 1997).

Note: If you need more information, please contact Nancy Stamm (
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
Database project personnel
Last modified: 15-Jan-2013