USGS MF-389 (C-5), LOC. 29, 30.USGS BULLETIN 692, P. 380.ALASKA DIV. OF MINES AND MINERALS GEOLOGIC REPORT 12, P. 8.USGS OF 76-866, P. 7-9.BEDROCK IS MAINLY ALTERED ANDESITIC TUFFS AND LAVAS (GREENSTONE) CUT BY MORE MAFIC (BIOTITE PYROXENITE) AND ACIDIC DIKES.