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U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts

 Detailed Bedrock Photographskip navbar


SAMPLE_ID:  00MW0605

DATE: 2/11/1999

Sample: 00MW0605 - Quartz Diorite


Sample 00MW0605 is a quartz diorite comprised of plagioclase (60%), quartz (5%), oxides (4%), epidote (2%), and sphene (1%). Some plagioclase is poikiloblastic, and seritization is common throughout. Quartz grains show subgrains and undulose extinction. Very pleochroic biotite occurs in bundles, as no foliation is recognized. Fine-grained epidote is likely an alteration product of mafics like hornblende (which is not present) and plagioclase.

Latitude: 41.63259

Longitude: -70.52599

Elevation of well site (m): 19.29

Elevation of the upper
bedrock surface (m):

Elevation of the
top of casing (m):

Total thickness of strata
penetrated by the well (m):

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OFR03-221 Home | Introduction | Bedrock Photographs | GIS Data Catalog

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