The "Coral-trilobite bed" of Brett (1974) is here [informally] named the Smoke Creek Bed of the Windom Shale Member of the Moscow Formation of the Hamilton Group. It extends from Lake Erie east to Canandaigua Valley, NY, and consists of hard, calcareous mudstone. Overlies the Bay View Coral Bed in the lower part of the Windom. Thickness is 25 to 40 cm. Age is Middle Devonian.

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

Windom Shale Member of Moscow Formation reaches a maximum thickness of 60 m in the eastern Finger Lakes area of NY. Here it consists of medium to dark gray fossiliferous mudstones and shales with thin concretionary limestone beds and can be divided into approximately 15 informal traceable units and a number of thin, localized shell-rich beds. Unit 5 has been designated Smoke Creek bed by Baird and Brett (1983). Interval consists of 0.2 to 1.0 m of concretionary, very argillaceous limestone. Rich in rugose corals and brachiopods, but lacks the larger corals and brachiopod SPINATRYPA of the underlying Bay View coral bed. Particularly noted for its abundant trilobites. Forms a single compact ledge at its type section along Smoke Creek, but splays into a series of three to five concretionary limestones with interbedded calcareous shales in eastern Erie and Genesee Cos. Where it is thickest, fossil occurrence decreases, but in the eastern Finger Lakes region where it is relatively thin, contains thin beds of fossil hash, rich in crinoid and bryozoan debris. Underlies a 1 to 2-m-thick unnamed interval of soft medium gray, highly fossiliferous shale. Age is Middle Devonian (Givetian).

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