Open File; Mylar. Geology by Richard J. Fahey and Maurice H. Pease Jr. Bedrock geology mapped in 1973 by M.H. Pease Jr. in 1974-76 by R.J. Fahey assisted by Thomas Bulcock (summer 1974), Paul Banks (summer 1974), Brad Dean (summer 1974), Jonathan Husch (summer 1975), David London (summer 1975).