Highest division of Jaycox Member of Ludlowville Formation is here designated Benton Run Mudstone for exposures along the main channel of Benton Run at Seneca Lake, western NY. Unit is present from Hill's Gulch eastward into the central Finger Lakes region and consists of sparsely fossiliferous, calcareous, silty gray siliciclastic mudstone. Contains only a few brachiopods and other fauna in contrast to the underlying Cottage City Coral Beds (new). Bed thickens eastward from 5 cm at Hill's Gulch to 55 cm at the west shore of Canandaigua Lake and southward to 7.4 m at Kashong Glen, 4 km south of Benton Run. Thickness at type is 5.0 m. Underlies the Tichenor Member of the Moscow Formation. Age is Middle Devonian.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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