USGS Visual Identifier
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Geologic Unit: Red Hill

Red Hill Syenite of White Mountain Plutonic-Volcanic Suite (NH*)
Red Hill Complex of White Mountain Pluonic-Volcanic Suite (NH)

Jurassic, Early*
Geologic Province:
New England province*
Areal Extent:

Type Locality:
On and around Red Hill, southwestern corner of Mount Chocorua 15-min quadrangle, east-central NH (Smith and others, 1938).

Garland Peak Syenite, Watson Ledge Quartz Syenite, firetower syenite, interior fine granite, outer coarse syenite, nepheline sodalite syenite

Unit Name History:
[Please note: only the Dorais and Floss (1992) and Lyons and others (1997) references are synopsized here. Smith and others (1938) taken from US geologic names lexicon, USGS Bull. 1200. Chapman (1968), Size (1972), and Henderson and others (1989) 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 Red Hill complex (A.P. Smith and others, 1938, Geol. map and structure section of Mount Chocorua quadrangle, NH (1:62,500), New Hampshire Hwy Dept.).
Age modified (Chapman, 1968).
Overview; Age modified (Size, 1972).
Age modified; Isotopic dating (Henderson and others, 1989).
Overview (Dorais and Floss, 1992).
NH State Geol. Map usage; Isotopic dating (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