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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:  82MW0012

DATE: 1/23/2001

Sample: 82MW0012 - Orthogneiss


Orthogneiss sample 82MW0012 contains a mineral assemblage of K-feldspar (38%), plagioclase (35%), quartz (20%), biotite (5%), and trace amounts of muscovite, oxides, sphene, epidote, and chlorite. This rock is characterized by perthitic porphyroclasts of K-feldspar (up to 8 mm) in a matrix of biotite and fine, hexagonal grains of recrystallized quartz, plagioclase and K-feldspar. Large sphene grains (up to 1.3 mm) are rimmed by muscovite and biotite. Plagioclase shows albite twinning, seritization, and some antiperthite and myrmekite.

Latitude: 41.63700

Longitude: -70.59434

Elevation of well site (m): 46.16

Elevation of the upper
bedrock surface (m):

Elevation of the
top of casing (m):

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

A Thin Section of this image is available.

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

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