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 published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).