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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:  80MW0012

DATE: 3/18/2002

Sample: 80MW0012 - Orthogneiss


Sample 80MW0012 is a biotite orthogneiss with a mineral assemblage of plagioclase (50%), K-feldspar (18%), quartz (15%), biotite (12%), sericite (3%), sphene (1%), and trace oxides, chlorite, and epidote. Plagioclase occurs in very altered porphyroclasts, wrapped by biotite domains. Microperthitic K-feldspar grains are significantly smaller than plagioclase porphyroclasts. Quartz commonly occurs in ~3mm long aggregates aligned with the biotite domains, defining a minor foliation.

Latitude: 41.63785

Longitude: -70.5810

Elevation of well site (m): 35.21

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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