McCarthy 39 mi (63 km) NW Chisana 48 mi (77 km) NW Chitina 89 mi (143 km) NW Alcan Border 90 mi (145 km) NE Anchorage 270 mi (435 km) SW
From Miller and Richter (1994) : "Both Mt. Bona and Mt. Churchill are high snow- and ice-covered mountains in the eastern part of the Wrangell volcanic field. They appear to be relatively young constructional forms. Mt. Bona, the highest peak (5,005) in the Wrangell Mountains, may be a small stratocone built upon a high platform of Pennsylvanian and Lower Permian rocks ." McGimsey and others (1992)  state that Mount Churchill is now known to be the source of the White River Ash, produced during two of the largest explosive eruptions in North America during the past 2000 years.
Geologic map of the McCarthy quadrangle, Alaska, 1978 MacKevett, E. M. Jr., 1978, Geologic map of the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1032, unpaged, 1 plate, scale 1:250,000.
A postulated new source for the White River Ash, Alaska, 1992 McGimsey, R.G., Richter, D.H., DuBois, G.D., and Miller, T.P., 1992, A postulated new source for the White River Ash, Alaska, in Bradley, D.C. and Ford, A.B., eds., Geologic Studies in Alaska by the U.S. Geological Survey, 1990: U.S. Geological Survey Bulletin 1992, p. 212-218. fulll-text PDF : 618 KB