Ground Penetrating Radar (GPR) data shows buried channel

PROVISIONAL DATA.

This image shows ground penetrating radar (GPR) data collected from a transect running North to South on Saint Jean Key in Fort De Soto Park, Pinellas County, Florida. The bold lines near the top of the plot indicate the position of the ground surface, with the colors below indicating reflections of radio waves from underground sediments. The reflections indicate the shape of historical island morphology as far back as several hundred years ago. Shown here, a u-shaped feature in the radar profile suggests the presence of a buried channel that was filled in by sediments that came from a northerly direction (diagonal lines filling the inside of the channel). Once the channel filled, sediment continued to deposit uniformly over this section of the island, forming the relatively flat surface seen today.