What is the abbreviation for the formation where USC is located?

The formation where USC (University of Southern California) is located is represented by the abbreviation QIs, which stands for Quaternary alluvial and marine sediments. This formation is important in geologic mapping as it pertains to the most recent geologic layer, primarily comprised of sediments deposited during the Quaternary period, which is characterized by significant geological and climatic changes.

Choosing QIs indicates familiarity with the local geology surrounding USC, which features these more recent sediments that can influence groundwater, land use, and earthquake activity in the area. This formation's age and characteristics are critical for various applications, including urban planning, environmental assessments, and understanding geological processes.

The other abbreviations correspond to different geologic formations not directly associated with the substrate under USC. Understanding these distinctions is essential for accurately interpreting geologic maps and assessing the geological history of a region.