|Geologic age||Upper Silurian|
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Carbonate > Dolostone
Sedimentary > Clastic > Mudstone > Shale > Black-shale
|Comments||part of Akron Dolostone, Cobleskill Limestone, and Salina group 700-1000 ft. (210-300 m). Secondary unit description from USGS website (ref. NY046) and reference NY030: Vernon Formation of Salina Group contains at least four eurypterid-bearing black shale horizons in western NY here described as lowermost(?) Harris Hill Bed (new name) at East Penfield, and Monroeav (new name), Pittsford (revised), and Barge Canal (new name) Beds at Pittsford, NY. Beds vary in thickness from approximately 1 ft for the Harris Hill to 7 ft for the Monroeav Bed. A thin dolomitic interval in the type area of the Vernon Formation in central NY containing eurypterids and fish remains is here named the Downing Brook Bed (Ciurca, 1990).|
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.
Ciurca, S.J., Jr., 1990, Eurypterid biofacies of the Silurian-Devonian evaporite sequence; Niagara Peninsula, Ontario, Canada, and New York, IN Lash, G.G., ed., Western New York and Ontario; field trip guidebook: New York State Geological Association Guidebook, no. 62, 62nd Annual Meeting, Fredonia, NY, p.Sat/Sun D1-D30.
USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/
|Counties||Cayuga - Madison - Monroe - Oneida - Onondaga - Ontario - Wayne|