A 177-m-long core designated CL-80-1 was taken from Clear Lake, Calif., during July and August, 1980, at latitude 39.08°N, longitude 122.84°W (fig. 1). The core was removed from Clear Lake for interdisciplinary studies and regional correlation of paleoclimates, paleoecologies, paleolimnology, Quaternary dating techniques, and frequency of volcanic eruptions. This catalog is designed to help investigators identify samples taken from the core that are most appropriate for their discipline.