Middleville Formation here newly defined to include all of the pre-Valley Heads deposits currently identified in the West Canada Valley, east-central NY. These include the basal White Creek Diamicton (new name), the lower and upper Newport Beds (new name), and the West Canada Diamicton (new name). The West Canada Diamicton separates the lower and upper Newport Beds. The West Canada "A" Diamicton occurs locally within the lower Newport Beds. Members differentiated on the basis of provenance. The Middleville unconformably overlies bedrock and unconformably underlies the Valley Heads Drift. Upper irregular boundary, named Shed Brook discontinuity by Ridge (1985), probably represents ice recession, lake drainage, and subaerial erosion during the Erie interstade. Unit is at least as old as the Nissouri stadial (>15.5 ka).

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