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Trachyte porphyry

Trachyte porphyry - laccolith (?) at Cannon's Point near Willsboro, Essex County.
State New York
Name Trachyte porphyry
Geologic age Jurassic - Lower Cretaceous
Primary rock type trachyte
Secondary rock type
Other rock types
Lithologic constituents
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-trachyte (Laccolith)
Map references
NYS Museum, NYS Geological Survey, NYS Museum Technology Center, 1999, 1:250,000 Bedrock geology of NYS, data is distributed in ARC/INFOr EXPORT format (with ".e00" extension) in 5 seperate files based on printed map sheets,
Unit references
D. W. Fisher; Y. W. Isachsen, L. V. Rickard, 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 1:250000.
Counties Essex