Kinzers Formation in the West York block of the Conestoga Valley, York Co., PA, is here subdivided into the basal Emigsville Member (Gohn, 1976), the York Member (new name), and the Greenmount Member (new name). York Member is well exposed in Pit 1 at the Delta Carbonate Quarry. York previously designated Thomasville member (informal) by Gohn (1976) for exposures at the Thomasville Quarry, which are not typical of the unit. Thickness at the Delta Carbonate is approximately 1000 to 1200 ft. However, the middle member of the Kinzers in Lancaster Co. as described by Stose and Stose (1944) measures only 75 ft. York Member consists of very pure to moderately pure carbonates. Primary sedimentary features include oolites, burrows, indistinct reefy structure, some desiccation features, bioclastic lag deposits and megaconglomerate. Coarse crystalline texture of pure white limestones characteristic.

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