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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:  27MW0107

DATE: 7/9/1998

Sample: 27MW0107 - Diabase


Sample 27MW0107 is a diabase with a composition of plagioclase (50%), clinopyroxene (20%), chlorite (20%), oxides (8%), hornblende (1%), and trace epidote and sericite. Plagioclase occurs as elongate lath-shaped phenocrysts; it is turgid and seritized. Clinopyroxene, probably augite, occurs mainly as 0.2-mm sized matrix grains. Biotite and olivine have been fully altered to chlorite, leaving relict grains. Anhedral hornblende and oxides are commonly rimmed by chlorite.

Latitude: 41.65925

Longitude: -70.58548

Elevation of well site (m): 60.42

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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