Plattekill and Ashokan Formations

Shale, sandstone; Ashokan Formation-shale, sandstone.
State New York
Name Plattekill and Ashokan Formations
Geologic age Middle Devonian
Lithologic constituents
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstone > Shale
Comments part of Hamilton Group 2600-2800 ft. (790-850 m).

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 Ulster