Austin Glen Formation

Graywacke, shale
State New York
Name Austin Glen Formation
Geologic age Middle Ordovician
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone > Graywacke
Comments part of Trenton Group and Metamorphic Equivalents up to 8000 ft. (2400 m). Unit is also listed as part of part of Eugeosynclinal (Allochthonous) Sequence on printed map and uses a different color to map; however, on the digital map both units of Oag are mapped together. I followed the digital map and did not separate the unit into 2 provinces (the unit descriptions are identical).
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 - Orange - Sullivan - Ulster