USGS Visual Identifier
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Geologic Unit: Islesboro

Islesboro Formation (ME*)

Proterozoic, Late(?)*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Islesboro, Waldo Co., central southern ME (Smith and others, 1907).

Unit Name History:
[Please note: only the Rankin and others (1993) and Stewart (in press) 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 (Smith and others, 1907).
Overview (Allen, 1951).
ME State Geol. Map usage; Age modified (Hussey and others, 1967).
Age modified (Stewart and Wones, 1974).
ME State Geol. Map usage (Osberg and others, 1985).
Age modified (Rankin and others, 1993).
Revised; Age modified (Stewart, in press).

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