 He also produced one of the earliest ethnoarchaeological studies of pottery-making among the surviving native peoples of his region (Rogers 1936; Panich and Wilken-Robertson 2013).Rogers' contributions were sometimes confusing to his successors, as in the case of his changing nomenclature for the San Dieguito Complex and its constituent phases.Working primarily before the advent of radiocarbon dating, he adhered to a short chronology for regional prehistory that has subsequently been discarded.