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Jumbo Dome description and information


Official Name: Jumbo Dome
Type:A large cylindrical plug of hornblende andesite
Most Recent Activity:
Seismically Monitored: No
Elevation: 4491 ft (1369 m)
Latitude: 63.975° N
Longitude:148.69444° W
CAVW Number:
Pronunciation: Sound file
Nearby towns:Ferry 9 mi (14 km) NW
Denali Borough 12 mi (19 km) SW
Healy 12 mi (19 km) SW
McKinley Park 18 mi (29 km) SW
Anchorage 194 mi (312 km) SW
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.
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Page modified: June 12, 2014 07:20
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