Nedrow member of Onondaga limestone named in this report for town of Nedrow near type section at Indian Reservation quarry, Onondaga Co., central NY. Unit consists of thin-bedded and shaly limestones marked in lower part by abundant platyceratid gastropods. Upper part is more massive limestone with sparse fauna. Beds are medium gray, very fine grained, and argillaceous. Thickness 10 to 14 ft. Westward from type locality Nedrow passes into cherty limestone, and eastward into coarse limestone. Overlies Edgecliff member (new) with sharp contact. Underlies Moorehouse member (new) with transitional contact. Onondaga in NY is generally considered Middle Devonian (Onesquethawan).

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

The Nedrow Member overlies the Edgecliff Member, which in this report has been subdivided into a Clarence facies (previously Clarence Member of western NY) and a Jamesville Quarry facies. The Nedrow does not pass laterally into cherty limestone (Clarence facies) as originally thought, but overlies it. Authors have recognized several marker beds within the Nedrow that aid in correlating the western NY sections. The contact between the Nedrow and the overlying Moorehouse Member was originally placed within an interval of interbedded shales and limestones. Authors have found that this interval cannot be traced any great distance. They have recently recognized a pair of black to dark gray shale-dominated beds within the upper Nedrow and use them "functionally" as the upper boundary. At Seneca Stone quarry, the Nedrow is approximately 4.2 m thick. The basal shales are typically medium dark gray, but contain scattered brachiopods and rugose corals. The lower 3 m consists of alternations of medium gray, sparsely fossiliferous, calcareous shales, and gray, somewhat nodular, highly argillaceous and noncherty limestones. Above this interval are several prominent marker beds, including the shaly SCHIZOPHORIA bed at the top of the Nedrow that can be traced from the Syracuse region to central PA in the middle portion of the Selinsgrove Limestone, and to the mid-Hudson Valley area in the Onondaga. Age is Middle Devonian (Eifelian).

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