INNOVATION IN NEW GEOLOGIC MAPPING OF THE LOWER COLORADO RIVER CORRIDOR, SOUTHWEST USA
For additional geologic analysis and map-checking, we use an automated script to extract the elevation range of all LOCO group map polygons from a 10-m DEM according to their geospatial position and project them onto the river's longitudinal profile. Each LOCO group unit tracks past positions of the river at a specific points in time and can reveal potential impacts of coeval or post-depositional tectonic activity. Geologic inferences from unit profiles rely on proper classification and mapping, and this sets a quality-assurance and field-checking priority for the mapping. Areas where an outcrop’s position deviates from a dominant trend are field-checked to determine if the deviation indicates a geologic control on the river’s long-term evolution or if the mapping, location, or DEM-derived elevation is incorrect. Points crucial for anchoring the vertical position of the unit profiles are surveyed in the field with high-precision GPS. The multi-scale maps, compilation, and profile datasets evolve and improve in tandem to inform our interpretations of the geologic evolution of the area while also identifying locations of related geologic resources.