Russia Member of Denley Limestone (Trenton Group) is divided into Wolf Hollow, Brayton Corners, and High Falls divisions. Wolf Hollow division of the Russia Member includes nodular calcilutites to wackestones. It is marked by intervals of poorly bedded, conspicuously nodular, muddy carbonate. Steinkerns and trilobites abundant. At base, North Gage Road bed (new, informal), a bioturbated packstone, forms a 0.2 m ledge in its type locality at Rathbun Brook. The North Gage Road bed may correlate with a 0.7-m-thick interval of wacke- to packstone that crops out at Trenton Falls, just above Sherman Falls. The bed overlies the Poland Member of the Denley Limestone. Age is Middle Ordovician.

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