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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:  28MW0035

DATE: 10/16/1998

Sample: 28MW0035 - Amphibolite


Sample 28MW0035 is an amphibolite with a composition of hornblende (40%), plagioclase (35%), chlorite (9%), quartz (8%), sericite (3%), epidote (2%), biotite (1%), oxides (1%), and trace alkali-feldspar. Hornblende defines the foliation and shows irregular grain boundaries, oxide inclusions, carlsbad twins and strong pleochroism. A matrix of fine plagioclase is partially altered to sericite. Coarse quartz grains occur in 0.4 mm-thick aggregates. Epidote, showing subgrains and undulose extinction, occurs throughout. Biotite defines a foliation and has been almost entirely altered to chlorite. 

Latitude: 41.63331

Longitude: -70.52557

Elevation of well site (m): 18.14

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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