Core drilling in poorly exposed Lower and Middle Pennsylvanian strata of the Pottsville and Allegheny Groups in northeastern Ohio has led to a better understanding of the character and distribution of key Pennsylvanian marine units. Two unknown and three previously known marine and marine-influenced units are identified in strata of this area in the Pottsville Group. Distribution and facies maps of these marine units in northeastern Ohio suggest pre-Pennsylvanian erosional paleotopography and periodic movement on subsurface faults locally influenced depositional patterns. Additionally, the traditional placements of the Lowellville marine unit and the Quakertown coal in the stratigraphic column for Ohio appear to be in error. The new data suggest the need for an extensive revision of the geologic column for the Lower and Middle Pennsylvanian rocks in Ohio and the need to develop a more representative stratigraphic nomenclature and framework for these rocks. Core drilling referenced in this investigation was done as part of the recent statewide mapping and core-drilling program conducted by the Ohio Geological Survey.

Abstract Complex Quaternary deposits are well exposed alongthe west of McCracken Road. The pit has been used asa landfill valley of Mill Creek, in Garfield Heights (Shaker Heights 7½- through the years and is now partof an industrial park. A major minute Quadrangle), Cuyahoga County, Ohio (Fig. 1).Details of interstate highway, 1-480 (Fig. 1), passes through and partially the stratigraphy can be examined best at two sections exposed covers some of the units that were previously exposed in the along the steep-wall of an abandoned sand and gravel pit north-steep-wall just southeast of McCracken Road. Access to the northwest pit may be made through an entrance road to the industrial park, which joins the northwestern side of McCracken Road about 100 ft (30 m) southwest of the intersection of the Conrail right-of-way and McCracken Road. Vehicles should be parked close to the steep-wall of the pit and as far as possiblefrom buildings in the industrial park.