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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:  95MW0212

DATE: 7/25/1998

Sample: 95MW0212 - Syenitic Mylonite


Sample 95MW0212 is a syenitic protomylonite containing K-feldspar (70%), plagioclase (25%), unidentifiable fine matrix material (4%), oxides (1%), and trace epidote. K-feldspar is up to 40% perthitic and tartan twinned, occurring in the matrix and as porphyries. Plagioclase shows albite twinning and subgrains in non-recrystallized clasts. Matrix material is ultra fine-grained and shows a high birefringence. It is probably a "mesh" of felsic minerals. Oxides occur as rounded, bulbous grains, in proximity to epidote.

Latitude: 41.61868

Longitude: -70.54209

Elevation of well site (m): 23.59

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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