Ferry 9 mi (14 km) NW Healy 12 mi (19 km) SW Denali Borough 12 mi (19 km) SW McKinley Park 18 mi (29 km) SW Anchorage 194 mi (313 km) SW
DESCRIPTION
From Albanese (1980) [1]: "Jumbo Dome is a large cylindrical plug of hornblende andesite 1.6 km long, 1.3 km wide, and 500 m high which intrudes the Devonian Keevy Peak Formation basement and overlying Tertiary Suntrana Formation." Ar/Ar dating by Athey and others (2006) [2] yields an age for Jumbo Dome of 1.026 +/- 0.057 Ma.