Trachyte porphyry

Laccolith (?) at Cannon's Point near Willsboro, Essex County.
State New York
Name Trachyte porphyry
Geologic age Jurassic - Lower Cretaceous
Lithologic constituents
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-trachyte (Laccolith)

Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250,000.

NGMDB product
Counties Essex