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Equigranular granitic gneiss (VTY3Ag;0)

Geologic Formation near Chittenden, VT

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Lithology

Paragneiss

Geologic Age

Stenian (1122.4 Ma – 1115.7 Ma ago)

Geologic Unit Label

Y3Ag

Equigranular granitic gneiss. Enclaves of metasedimentary units in these granites and associated gneisses are locally albitized and enriched in magnetite; enclaves of highly aluminous altered rocks now contain restites of chloritoid and abundant sericite. U-Pb zircon ages of 1,119±3.3 Ma (no. 15) and 1,121±1.4 Ma (no. 14) determined on samples near Sherburne Center and on Telegraph Hill east of Chittenden Reservoir by Karabinos and Aleinikoff (1990). Chittenden Intrusive Suite (1,149±8 Ma to 1,119±3 Ma). Mount Holly Complex intrusive rocks. Rocks of the Green Mountain and Lincoln Mountain massifs and eastern domes.

— USGS

Taxonomy

Classified As

Geologic Formation