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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:  82MW0017

DATE: 8/5/2002

Sample: 82MW0017 - Orthogneiss


Sample 82MW0017, an orthogneiss, contains K-feldspar (35%), quartz (35%), plagioclase (27%), biotite (1%), muscovite (1%), and trace oxides and epidote. K-feldspar occurs as fractured porphyroclasts (fractures are filled by quartz and plagioclase), and as finer matrix grains. Quartz shows subgrains, undulose extinction, and some recrystallization with hexagonal grains, which is also common in matrix plagioclase. Elongated quartz aggregates, biotite, and muscovite define a foliation that wraps larger K-feldspar and plagioclase porphyroclasts. Seritization is common in plagioclase.

Latitude: 41.638374

Longitude: -70.591204

Elevation of well site (m): 36.86

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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