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Geologic Unit: City Brook
Map showing publication footprint
  • Usage in publication:
    • City Brook bed
  • Modifications:
    • First used
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Adirondack uplift
Publication:

Baird, G.C., Brett, C.E., and Lehmann, David, 1992, The Trenton-Utica problem revisited; new observations and ideas regarding Middle-Late Ordovician stratigraphy and depositional environments in central New York, IN April, R.H., ed., Field trip guidebook: New York State Geological Association Guidebook, 64th annual meeting, Hamilton, NY, September 18-20, 1992, no. 64, p. 1-40.


Summary:

The informally named City Brook bed (TROCHOLITES bed of Kay, 1953) defines the base of the Poland Member of the Denley Limestone (Trenton Group) in central NY. It is an intensely bioturbated pack- to wackestone and is exposed from the Trenton Falls area to near Countryman, NY. Bed is named for the excellent exposure on Wolf Hollow Creek (City Brook) just above City Falls. Southeast of Little Falls, the City Brook bed is cut out by erosion. Bed may be correlative with the Camp Member of Chenoweth (1952), in which case the name Camp would have precedence. The City Brook overlies the Rathbun Member of the Sugar River Limestone and is overlain by fossiliferous micrites and interbedded dark shales typical of the Poland. Age is Middle Ordovician (Mohawkian).

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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