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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:  82MW0013

DATE: 4/5/2001

Sample: 82MW0013 - Granite


Sample 82MW0013 is an unfoliated granite comprised of K-feldspar (40%), quartz (33%), plagioclase (25%), muscovite (1%), and trace oxides and epidote. Perthitic K-feldspar shows tartan twins and variable grain size (0.05-4 mm). Quartz grains, occurring in the matrix, are variable in size and have few subgrains and relatively straight grain boundaries. Muscovite occurs in the matrix and in some grains shows wavy or folded mineral cleavage. In general, this rock is less altered than most granites in the study area.

Latitude: 41.64103

Longitude: -70.57682

Elevation of well site (m): 35.43

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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