“…Such significant results as have been achieved were largely the accomplishments of three men: Callaghan (1938Callaghan ( , 1939Callaghan ( , 1973Callaghan and Parker, 1961a, 1961b, 1962a, 1962bWillard and Callaghan, 1962), who mapped several quadrangles centered around Marysvale, Utah; Kerr (1963Kerr ( , 1968Kerr and others, 1957), who with his students refined and expanded parts of Callaghan's work in the Marysvale uranium district; and Gregory (1944Gregory ( , 1945Gregory ( , 1949Gregory ( , 1950Gregory ( , 1951, who dealt with parts of the Paunsaugunt, Sevier, and Markagunt Plateaus.…”