Snavely, Parke D. Jr., Alan Niem, Florence L. Wong, Norman S. Macleod, Tracy K. Calhoun, and U.S. Geologial Survey. Geologic map of the Cascade Head area, northwestern Oregon Coast Range: (Neskowin, Nestucca Bay, Hebo, and Dolph 7.5 minute quadrangles). Reston, VA: The Survey, 1996.