Biddie Knob Formation (VTCAZbk;0)

Biddie Knob Formation

Predominantly green, purple and purplish-red, chloritic hematitic slate and phyllite, massive to thinly bedded. Has rare thin beds of white vitreous quartzite and contains abundant chloritoid. Underlies the Bird Mountain Grit (of Dale, 1900) and grades into the green slate of the Mettawee slate facies in the Bull Formation, probably in part correlative with the green phyllite member of the Netop Formation (CZngs) of the Dorset Mountain slice. Rocks of the Giddings Brook, Sunset Lake, and Bird Mountain slices. Part of the Taconic Allochthon.

State	Vermont
Name	Biddie Knob Formation
Geologic age	Lower Cambrian and Neoproterozoic
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > PhyllitePredominantly green, purple and purplish-red, chloritic hematitic slate and phyllite. Metamorphic > Metasedimentary > Metaclastic > SlatePredominantly green, purple and purplish-red, chloritic hematitic slate and phyllite. Incidental Metamorphic > Metasedimentary > Metaclastic > QuartziteHas rare thin beds of white vitreous quartzite and contains abundant chloritoid.
References	Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000. https://pubs.er.usgs.gov/publication/sim3184
NGMDB product	NGMDB product page for 96860
Counties	Rutland

Biddie Knob Formation

Ratcliffe, N.M., Stanley, R.S., Gale., M.H., Thompson, P.J., and Walsh, G.J., 2011, Bedrock geologic map of Vermont: U.S. Geological Survey Scientific Investigations Map 3184, 3 sheets, scale 1:100,000.