U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape
Cod, Massachusetts
![]() Phyric basalt (36MW1041) showing altered plagioclase phenocrysts and relict euhedral olivine grains that are completely altered to chlorite in a plagioclase + clinopyroxene matrix. Click here for a zip file with full resolution image. chl: chlorite |
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