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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:  80MW0014

DATE: 9/16/2002

Sample: 80MW0014 - Orthogneiss


Sample 80MW0014 is a banded orthogneiss composed of K-feldspar (50%), quartz (30%), plagioclase (17%), chlorite (2%), oxides (1%), and trace garnet, biotite and muscovite. Porphyroclasts of both plagioclase and K-feldspar reach lengths of 10mm. Elongated, perthitic K-feldspar grains are aligned in the foliation. Plagioclase is in some cases heavily altered and possibly antiperthitic. The garnet appears to be metamorphic, and may suggest lower amphibolite facies conditions. Nearly all biotite is altered to chlorite. 

Latitude: 41.630559

Longitude: -70.615932

Elevation of well site (m): 19.58

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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