U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Assabet
Search archives
Map showing publication footprint
  • Usage in publication:
    • Assabet Quartz Diorite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • New England province
Publication:

Goldsmith, Richard, Wones, D.R., and Shride, A.F., 1982, Stratigraphic names in eastern Massachusetts and adjacent states, IN Stratigraphic notes, 1980-1982: U.S. Geological Survey Bulletin, 1529-H, p. H57-H72.


Summary:

Assabet Quartz Diorite and Straw Hollow Diorite are considered to be roughly equivalent in age to Sharpners Pond Diorite, which is Silurian (based on U-Th-Pb zircon age of 430 +/-5 m.y. by R.E. Zartman and R.S. Naylor, 1981, written commun.).

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Assabet Quartz Diorite*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
Publication:

Zen, E-an (editor), Goldsmith, Richard (compiler), Ratcliffe, N.M. (compiler), Robinson, Peter (compiler), Stanley, R.S. (compiler), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., and Wones, D.R., 1983, Bedrock geologic map of Massachusetts: U.S. Geological Survey [State Geologic Map], 3 sheets, scale 1:250,000


Summary:

Used as Assabet Quartz Diorite of Silurian age. Mapped undifferentiated from Straw Hollow Diorite. Intrudes Nashoba Formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Assabet Quartz Diorite*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
Publication:

Wones, D.R., and Goldsmith, Richard, 1991, Intrusive rocks of eastern Massachusetts, Chapter I, IN Hatch, N.L., Jr., ed., The bedrock geology of Massachusetts: U.S. Geological Survey Professional Paper, 1366-E-J, p. I1-I61.


Summary:

Assabet Quartz Diorite is mapped together with Straw Hollow Diorite on MA State bedrock geologic map by Zen and others (1983) because of their similar occurrence and general lithology, and their small size. Assabet covers an area of 23 sq km. Probably intrudes Marlboro Formation, although no contacts have been observed; intruded by aplite and pegmatite dikes which may be equivalent to granite that intrudes Sharpners Pond Diorite. [Papers presented as chapters in U.S. Geological Survey Professional Paper 1366 are intended as explanations and (or) revisions to MA State bedrock geologic map of Zen and others (1983) at scale of 1:250,000.]

Source: GNU records (USGS DDS-6; Reston GNULEX).


Search archives

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:11:43 PM MDT