Name Athol Springs bed of Kloc (1983, SUNY MS thesis) is here "formalized and adopted for usage." Type locality described on Lake Erie shore where unit forms a resistant limestone cap 10 to 15 cm thick on wave-cut cliff. Ripple-marked upper surface is covered by STYLIOLINA. Unit is characterized by planispiral gastropod STRAPAROLLUS, which is nearly unique to this horizon. This marker bed has long been recognized and was referred to as the "PTEROPOD bed" by Grabau (1899), the "PHANEROTINUS bed" by Cooper (1929), and the "STRAPAROLLUS bed" by McCollum (1980, PhD. dissert.). Athol Springs forms the uppermost bed of the newly named Winspear submember [informal] of the Ledyard Member of the Ludlowville Formation. Above the Athol Springs is the newly named Elma submember [informal]. Age is Middle Devonian.
["Submember" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Considered informal until formally published. The rank or lithologic term should not be capitalized.]

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