Late Mississippian and Early Pennsylvanian Conodonts Arkansas and Oklahoma

The type area for the Springerian stratigraphic sequence is in southern Oklahoma (Carter County) and that of the Morrowan is in northwestern Arkansas (Washington County). In the past, both series have been employed as comprising successive time-stratigraphic serial subdivisions of the North American Lower Pennsylvanian. A conodont zonal scheme developed herein provides a means for correlations between both type sections and demonstrates that the Springerian overlaps with the underlying Chesterian and overlying Morrowan. Therefore, usage of the Springerian as a viable subdivision of the Lower Pennsylvanian should be discontinued.