Ironbound Mountain Formation (VTDi;0)

Ironbound Mountain Formation

Medium-dark-gray to grayish-black lustrous slate, phyllite, and schist containing sparse to moderately abundant 1-mm to- 5-cm-thick beds of light-gray, fine-grained metasandstone and metasiltstone, commonly pyritiferous and calcareous. Some graded beds. Gradational contact with Dco above and Dir below. Interpreted to be correlative with the Meetinghouse Slate Member of the Gile Mountain Formation. Part of the Connecticut Valley Trough.

State	Vermont
Name	Ironbound Mountain Formation
Geologic age	Lower Devonian
Lithologic constituents	Major Metamorphic > SchistMedium-dark-gray to grayish-black lustrous slate, phyllite, and schist. Metamorphic > Metasedimentary > Metaclastic > SlateMedium-dark-gray to grayish-black lustrous slate, phyllite, and schist. Metamorphic > Metasedimentary > Metaclastic > PhylliteMedium-dark-gray to grayish-black lustrous slate, phyllite, and schist. Minor Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneFine-grained metasandstone and metasiltstone, commonly pyritiferous and calcareous. Metamorphic > Metasedimentary > Metaclastic > MetasandstoneFine-grained metasandstone and metasiltstone, commonly pyritiferous and calcareous.
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	Essex

Ironbound Mountain 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.