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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:  81MW0016

DATE: 10/3/2001

Sample: 81MW0016 - Orthogneiss


An orthogneiss, sample 81MW0016 contains K-feldspar (40%), plagioclase (35%), quartz (21%), chlorite (2%), oxides (1%), and trace muscovite, sphene, and epidote. Perthitic K-feldspar, occurring in the matrix and as porphyroclasts, shows subgrains, tartan twinning, and inclusions of quartz and plagioclase. Any biotite present has been totally altered to chlorite. A foliation is present, defined by chlorite and elongated quartz aggregates.

Latitude: 41.63040

Longitude: -70.57556

Elevation of well site (m): 28.92

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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