Figure 25. Relative sea-level curve for the Upper Devonian-Lower Mississippian (upper Famennian-lower Tournaisian) Rockwell Formation of western Maryland (based on Beuthin (1986a) with minor modifications). Curve does not indicate absolute magnitude, nor absolute duration of any sea-level event. Devonian-Mississippian transition probably occurred during the time-interval encompassing Cussewago-Bedford regression or "Berea" incision and sedimentary bypassing. |