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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:  27MW0105

DATE: 6/12/1998

Sample: 27MW0105 - Granite


A granite, sample 27MW0105 contains plagioclase (40%), K-feldspar (36%), quartz (20%), biotite (3%), and trace muscovite, sphene, oxides, chlorite, and epidote. Plagioclase grains are equigranular and fine-grained, showing some recrystallization and myrmekite. K-feldspar occurs as tartan twinned matrix grains and as perthitic porphyries with plagioclase inclusions and overgrowths. Quartz grains show a wide size variation and occur in the matrix. Biotite is partially overgrown by chlorite, and is aligned in a weak foliation. Sphene is visible in hand sample as mm-sized rhombohedral grains.

Latitude: 41.65535

Longitude: -70.59130

Elevation of well site (m): 50.28

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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