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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:  03MW2152

DATE: 12/11/1998

Sample: 03MW2152 - Orthogneiss


Sample 03MW2152 is a porphyritic chlorite orthogneiss with an estimated composition of plagioclase (30%), K-feldspar (25%), quartz (20%), chlorite (15%), muscovite/sericite (6%), epidote (3%), sphene (1%) and trace oxides. Porphyroclasts of feldspar are wrapped by muscovite and chlorite (which probably replaced biotite) resulting in an augen texture. Alteration of plagioclase has resulted in the growth of secondary sericite. Quartz shows interlocking grains and some aggregates aligned in the foliation.

Latitude: 41.65664

Longitude: -70.54919

Elevation of well site (m): 36.88

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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