U.S. Geol. Surv. Bull. 1028-L: 267-369.

–P. 289: {"Vertebrate-fossil remains, chiefly teeth, have been found in greenish volcanic graywacke exposed in a quarry on the north side of Unalaska. These teeth were identified by G. Edward Lewis (written communication, 1954) as those of Cornwallius sp., a marine mammal of early Miocene age."}