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Cited by 13Geological and Geochemical AnalysisGeological Studies and ExplorationGeological and Geophysical Studies

The DOI matches its Crossref record; 35 of the 44 references it cites were found in a registry or an index.

The bedrock geology of Massachusetts

Hatch, Norman L.·1988·Professional Paper
DOI 10.3133/pp1366ad
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Abstract

The Rowe-Hawley lithotectonic zone, western Massachusetts, consists of metasedimentary and metavolcanic rocks between the west contact of the Rowe Schist and the east contact of the Hawley and Cobble Mountain Formations of Late Precambrian to pre-late Middle Ordovician age.All rocks in this zone, with the exception of minor Devonian intrusions discussed elsewhere, predate the Taconian orogeny.The Rowe Schist consists of complexly intercalated lenticular masses of green schist, gray schist, amphibolite, and serpentinized ultramafic rock.Intercalation of these rocks may be largely tectonic.The Moretown Formation to the east consists of light-gray pinstriped granofels and mica schist.The granofels typically contains significant amounts of plagioclase.North of the Massachusetts Turnpike, the Moretown is bounded on the east by felsic and mafic metavolcanic rocks and sulfidic black slates of the Hawley Formation of supposed Middle Ordovician age.Near the turnpike, the black slates pass by facies change southward into the basal of four members of the silvery-gray mica schists and gneisses of the Cobble Mountain Formation.Plagioclase gneiss and amphibolite of the pre-Silurian Collinsville Formation core three of four domes that arch the Silurian-Devonian blanket of the Connecticut Valley synclinorium.The Cobble Mountain is thought to rest unconformably on the Collinsville Formation.Lenses of ultramafic rock in the Rowe Schist and lower Moretown are thought to be slivers of oceanic crust mechanically emplaced into Rowe slope-rise sediments during an early stage of Taconian collision.Additional lenses in member C of the Cobble Mountain Formation are thought to represent olistostromal blocks shed eastward from an emerged part of the accretionary prism somewhat later in the Taconian orogeny.Pre-Silurian intrusive rocks are represented only by a gneissic granite northwest of Plainfield, a few small sills of foliated granite of possible syn-thrust (Taconian) age at Borden Brook Reservoir 5 km south of Blandford, and a small body of diorite southwest of Rowe.The exposed rock units of the Rowe-Hawley zone on the eastern limb of the Berkshire massif form a simple linear map pattern which contrasts with the more complex pattern of correlative rocks to the west in the Taconic allochthons and autochthonous platform.This apparently simple linear pattern is deceptive detailed mapping in the 1970's has shown that major faults not only separate several of the

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Crossref · 10.3133/pp1366ad

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Metadata

Authors
Hatch, N. L.
Affiliations
University of Vermont (US)
Corresponding author
Hatch, Norman L.
Venue
Professional Paper
Publisher
US Geological Survey
Published
1988
ISSN
  • 1044-9612 (ISSN-L)
  • 2330-7102
DOI
10.3133/pp1366ad
OpenAlex
W1522645764
Cited by
13
References
44
Citations by year
2025: 1 · 2023: 1 · 2021: 1 · 2015: 1
Type
report
Language
en
Open access
closed
Locations
USGS professional paper (publishedVersion)
Funders
  • National Science Foundation
  • U.S. Geological Survey
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
  • Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
Keywords
bedrock geology, Taconic orogeny, granofels, mica schist, ultramafic rocks, olistostrome, accretionary prism

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