Name Katsbaan Bed is here proposed for a bioturbated siltstone unit approximately 33 m above the base of the Otsego Member of the Mount Marion Formation (Hamilton Group) in east-central NY. Bed weathers dark gray to brown and is about 1 m in thickness. Considered a key marker bed, traceable along much of the outcrop belt. Upper and lower contacts of the unit are generally gradational with the surrounding silty shales. Taxa include pectenoid and pterinoid bivalves and diverse brachiopod fauna. Gastropods, bellerophonts, cephalopods, and bryozoans are numerous, along with crinoidal debris. The Katsbaan is one of four formally named Beds in this report. The Dave Elliott Bed occurs in the upper part of the underlying Berne Member of the Mount Marion. The Halihan Hill Bed defines the base of the Otsego Member and the Timmerman Hill Bed lies a few meters above the Katsbaan within the lower part of the Otsego.

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