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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:  03MW2617

DATE: 7/24/2000

Sample: 03MW2617 - Granite


Sample 03MW2617 is a granite containing K-feldspar (40%), quartz (30%), plagioclase (20%), biotite (4%), chlorite (3%), muscovite (1%), oxides (1%), and trace garnet, epidote, and sericite. K-feldspar porphyries show intergrowths with plagioclase. Biotite is being replaced by chlorite. Garnet, present in small amounts, is fine-grained (0.1-0.4 mm) and commonly rimmed by muscovite. Muscovite appears to cross-cut biotite, suggesting that it is probably a secondary mineral. No foliation is recognized.

Latitude: 41.63171

Longitude: -70.52675

Elevation of well site (m): 17.85

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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