Title: Upper Ordovician formations in the Maysville area, Kentucky
Abstract: Upper Ordovician strata in the Maysville area, Kentucky, are divided into five formations.The basal Kope Formation is overlain by the Fairview Formation.Above the Fairview are two newly defined map units, the Grant Lake Limestone and the overlying Bull Fork Formation.The Preachersville Member of the Drakes Formation overlies the Bull Fork.The Kope Formation consists of gray calcareous shale with thin layers of interbedded fossiliferous limestone.It is about 270 feet thick in the Maysville area.The Fairview Formation consists of closely interbedded fossiliferous limestone, shale, and minor limy siltstone.It is about 85 feet thick near Maysville.The Grant Lake Limestone is chiefly gray rubbly-weathering irregularly thin bedded fosisiliferous and argillaceous limestone having irregular partings and seams of gray calcareous shale.The Grant Lake is 100-120 feet thick in the Maysville area.The Bull Fork Formation consists of interbedded shale and limestone.Shale content increases from about 20 percent near the base to about 80 percent at the top.The shale is gray to greenish gray, calcareous, and locally fossiliferous.The limestone is chiefly gray, evenly thin to medium bedded, very fine to coarse grained, and very fossiliferous.The Bull Fork Formation is about 200 feet thick in the type area and thins southward.The Preachersville Member of the Drakes Formation consists of grayish-green calcareous to dolomitic mudstone and minor dolomitic limestone and dolomite.It is about 25 feet thick near Maysville and thickens southward.It is the uppermost Ordovician unit on the east flank of the Cincinnati arch. Bl