On barrier islands, lagoons and carbonate platforms / May 14

Starting early into the morning, we spend the time until noon in outstanding road-cuts providing a deep insight into the cyclic occurrence of lagoonal deposits, showing a slight influence of the nearby barrier islands, with thick carbonate units of open sea origin. This amazing outcrop of the Pottsville Formation stimulated a lively discussion whether sea level or climate variability was the external driver behind these terrigenous – biogenic alternations. The sea level fraction won by the strength of their arguments and the trucks on the interstate highway horned applause. On the way to our next geological target, we had a spectacular overview into the Appalachian basins and the Valley and Ridge region from the tri-state Pinnacle Overlook on the Cumberland Gap.