MAPPING BEDROCK AND LANDSLIDE SUSCEPTIBILITY ALONG DUCK CREEK IN BETTENDORF, IOWA
The Iowa state geologic map requires a slight update to the contact between the Devonian Wapsipinicon Group and the Pennsylvanian Cherokee Group. The contact identified within the study area shifts the previously known contact about 1 km west. ArcGIS is being used to create a geologic map of the area which will be submitted to the Iowa Geological Survey for processing.
The slopes overlying the Pennsylvanian System in the far western portion of the study area show signs of hummocky topography and possible ponded water. The tops of these slopes have been manipulated to allow houses to be built. Samples of the shallow subsurface will be analyzed for blue clay, which typically weathers from Pennsylvanian shale. A high-resolution DEM is being made from recently acquired LIDAR data for Scott County in order to highlight areas at risk of possible slope movement.