SAMPLE_ID:  69MW1603

DATE: 4/23/1999

ORTHOGNEISS

A fine-grained orthogneiss, sample 69MW1603 contains K-feldspar (36%), quartz (31%), plagioclase (25%), and biotite (8%). No oxides are present. K-feldspar grains are not perthitic and are often found in bands with less plagioclase. The sample is almost entirely recrystallized and nearly equigranular. Biotite defines a strong foliation throughout. Plagioclase shows some myrmekitic (intergrowths with quartz) textures and very minor alteration.

Latitude: 41.63477

Longitude: -70.60959

Elevation of well site (m): 29.64

Elevation of the upper
bedrock surface (m): -51.74

Elevation of the
top of casing (m): 30.44

Total thickness of strata
penetrated by the well (m): 82.91

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