Jumbo Dome description and statistics

Type:	A large cylindrical plug of hornblende andesite
Seismically Monitored:	No
Distance:	198 mi (319 km) from Anchorage
Elevation:	4491 ft (1369 m)
Latitude:	63.975° N
Longitude:	148.69444° W
Quadrangle:	Healy
CAVW Number:
Location Map:
Pronunciation:	Sound file

From Albanese (1980): "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) yields an age for Jumbo Dome of 1.026 +/- 0.057 Ma.