Radar~Equencestratigraphy: Anintegratedanalysisofascrollbarcomplex

We have conducted an integrated geophysical survey of a scroll bar complex on the<br>Piscataquis River, near South Sebec, Maine. A sequence stratigraphic interpretation of the radar<br>data shows that the prograding scroll bar complex is composed of clinoforms, which are fining<br>upward successions of point bar sands and silts that top lap into the overbank deposits and<br>downlap onto channel lag deposits that overlie a basal unconformity. The basal unconformity<br>consists of a Pleistocene glacio-marine clay which pinches out onto a glacially eroded bedrock<br>surface. Radiocarbon dating of organic material obtained from cores should provide a<br>chronostratigraphic framework which can be used to reconstruct the three-dimensional evolution<br>of the river channel.