Ascutney Mountain stock – hornfels (VTKhf;0)

Dense, compact hornfels consisting of recognizable but altered schists of the country rock. Shown only around main Ascutney Mountain stock in structural continuity with rocks outside the contact aureole. Locally aluminous rocks of the Waits River Formation contain andalusite, sillimanite, cordierite, pleonaste, and corundum; calcareous pelites contain diopside, quartz-wollastonite, plagioclase, grossular garnet, and scapolite. Part of the White Mountain Igneous Suite; Ascutney Mountain stock; Ascutney Mountain igneous complex - Consists of two plutons, a partial ring dike, and screens of volcanic rocks. K-Ar ages of 122 to 120 Ma (Foland and Faul, 1977).

State	Vermont
Name	Ascutney Mountain stock – hornfels
Geologic age	Early Cretaceous
Lithologic constituents	Major Metamorphic > Granoblastic > Hornfels (Hornfels)Dense, compact hornfels consisting of recognizable but altered schists of the country rock.
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	Windsor

State

Vermont

Name

Ascutney Mountain stock – hornfels

Geologic age

Early Cretaceous

Lithologic constituents

Major

Metamorphic > Granoblastic > Hornfels (Hornfels)Dense, compact hornfels consisting of recognizable but altered schists of the country rock.

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

Windsor