GeoLogic Mapping is a Division C event that returned for the 2019, 2020 and 2021 seasons. This event tests competitors' knowledge of structural geology, geologic history, map reading, and related topics. GeoLogic Mapping requires that students be proficient in both reading and constructing topographic maps, geologic maps, geologic cross sections (usually depicted as layers) and other projections. A working knowledge of Earth history is also necessary, with more in-depth review of tectonics, rock formation, lithologies, and geologic principles. Students should also be able to infer risks of geologic hazards such as landslides, floods, earthquakes, etc. In 2015, the topic of aquifers and underground fluids was added as well.