Shelburn formation. As proposed by Cumings, included rocks in the interval from top of coal VII to base of Merom sandstone, thus including in upper part beds that had previously been included in West Franklin and Ditney formations. Upper part of Cuming's Shelburn formation has been separated from it by Shrock and Malott (1929) who restored name West Franklin formation to include two limestone members and the shale and coal between them and by Malott (1948) who restored name Ditney for formation overlying West Franklin and underlying Merom sandstone. Shelburn is here restricted to those rocks above the unconformity that overlies coal VII or locally cuts out coal VII and below base of West Franklin formation. Contains 250 feet of sandstone, shale, limestone, and thin lenticular coal beds, of which only basal part, approximately 30 feet, of Busseron sandstone member is exposed in Linton quadrangle. [Age is Late Pennsylvanian.]

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 3564).