||Karl, S.M., Haeussler, P.J., Himmelberg, G.R., Zumsteg, C.L., Layer, P.W., Friedman, R.M., Roeske, S.M.,and Snee, L.W., 2015, Geologic map of Baranof Island: U.S. Geological Survey Scientific Investigations Map SIM-3335, pamphlet 82 p., 1 sheet, scale 1:250,000.
||Metasedimentary and metavolcanic rocks of Nakwasina Sound
||Light green, tan, and white, banded, siliceous, felsic, and calcareous semischist, quartzite, metatuff, and marble. Unit includes cm-scale bands of garnet-diopside-biotite schist. Buff-colored, massive aphanitic felsic rocks contain quartz eyes. Felsic and silicic semischist locally have relict volcaniclastic textures. Marble and semischist contain sparse biotite, sericite, and/or chlorite; epidote, diopside, and garnet. Composition and relict textures suggest protoliths include felsic to mafic volcanic breccia, tuff and volcaniclastic rocks, limestone, calcareous mudstone, siliceous mudstone, and chert. Shallow to deep marine depositional environment adjacent to a volcanic arc is inferred; bimodal felsic and mafic volcanic rocks suggest some volcanic rocks represent an interval of arc extension. Because the Goon Dip Greenstone has been correlated with the Nikolai Greenstone (Jones and others, 1977), which overlies the Skolai Group in the southern Wrangell Mountains, the rocks of Pzsv are stratigraphically equivalent to rocks of the Skolai Group