SEDIMENT ANALYSIS OF GRAIN LITHOLOGY OF THE WISONCSIN RIVER BARABOO, WI TO THE MISSISSIPPI RIVER
Twenty bedload samples were taken from three primary sampling sites: the area of Baraboo, Gotham, and Prairie du Chien. Individual sampling sites were chosen according to the accessibility from the shore. Samples were taken approximately 30-45 centimeters below the bed surface to minimize the interference of shore surface run-off, and were taken using a shovel by digging down into the sediment.
Sediment analysis was done on each of the twenty samples to determine grain size and mineral composition. Sediment color varied in the downstream direction from dark brown and black to an almost pure white color. . Samples collected from downstream sites contain significant, clean, quartz sand, most likely sourced from the nearby exposures of St. Peter Sandstone. This work suggests that proximal bedrock sources provide copious amounts of bedload sediment to parts of this stream, in some cases significantly diluting the amount of bedload sediment sourced from the upstream regions.