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National Geologic Map Database

Geologic Unit: Highlandcroft

Usage:

Highlandcroft Plutonic Suite (ME*,NH*,VT*)
Also spelled Highland Croft in some early reports.


Subunits:

Attean Quartz Monzonite, Fairlee Quartz Monzonite, Adamstown Granite, /Highlandcroft Granodiorite


Geologic age:

Middle Ordovician to Early Silurian*


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

Type area: body of plutonic rocks 2 mi northwest of Littleton, Grafton Co., NH (Billings, 1956).
Highland Croft was chosen from a large farm about 1.5 mi west-northwest of Littleton, Littleton 15-min quadrangle, Ammonoosuc River region, Grafton Co., northwestern NH (M. Billings, April 26, 1935, personal commun.).


AAPG geologic province:

New England province*


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 ([ ]).