State | Vermont |
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Name | Highlandcroft Granodiorite of Billings (1935, 1937) |
Geologic age | Early Silurian to Middle Ordovician |
Lithologic constituents | Major
Metamorphic > Metaigneous > MetaintrusiveMedium-greenish-gray to dark-greenish-gray, medium-grained, foliated metamorphosed granite, granodiorite, and tonalite containing quartz, microcline, saussuritized plagioclase, hornblende, biotite (chlorite alteration), and secondary calcite and sericite.
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References | |
NGMDB product | |
Counties | Essex |