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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:  80MW0004

DATE: 4/5/2001

Sample: 80MW0004 - Orthogneiss


A low-grade orthogneiss, sample 80MW0004 is composed of K-feldspar (35%), plagioclase (32%), quartz (20%), biotite (2%), oxides (1%), and trace muscovite. This rock appears to be unmetamorphosed in hand sample, yet thin section examination shows minor recrystallization, metamorphic textures, and grain size variation. Biotite grains define a weak foliation. Twinning is common in all feldspars. Plagioclase shows slight alteration to sericite/muscovite.

Latitude: 41.63257

Longitude: -70.59613

Elevation of well site (m): 44.47

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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