Mount Merino and Indian River Formations

Shale, argillite, chert.
State New York
Name Mount Merino and Indian River Formations
Geologic age Ordovician
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Argillite
Sedimentary > Clastic > Mudstone > Shale
Incidental
Sedimentary > Chemical > Chert
Comments part of Eugeosynclinal (Allochthonous) Sequence up to 4000 ft.? (1200 m).
References

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 Dutchess