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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:  69MW1603

DATE: 4/23/1999

Sample: 69MW1603 - Orthogneiss


A fine-grained orthogneiss, sample 69MW1603 contains K-feldspar (36%), quartz (31%), plagioclase (25%), and biotite (8%). No oxides are present. K-feldspar grains are not perthitic and are often found in bands with less plagioclase. The sample is almost entirely recrystallized and nearly equigranular. Biotite defines a strong foliation throughout. Plagioclase shows some myrmekitic (intergrowths with quartz) textures and very minor alteration.

Latitude: 41.63477

Longitude: -70.60959

Elevation of well site (m): 29.64

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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