Deschutes & Ochoco National Forests
Crooked River National Grassland

Oregon Volcanoes

Three Fingered Jack Volcano

SUMMARY

Type: shield volcano.
Activity: extinct
Last Eruption: estimated about 250,000 yrs ago
Rock Type: basaltic andesite
Eruptive Volume: ?
Latitude: 44.48 N
Longitude: 121.84 W
Location Maps: from TIGER Mapping Service

• State Level - shows state and communities
• County Level - shows county lines, highways, and communities
• Local Level - shows above plus lakes and local roads

Topo Map from TopoZone

Three Fingered Jack Photo Menu

GEOLOGIC BACKGROUND:

Three Fingered Jack is a deeply glaciated shield volcano like many of the peaks along the Cascade crest.

HISTORIC ACTIVITY:

• None

DATA SOURCE:

• USGS

ADDITIONAL INFORMATION

• Link to U.S.G.S. - CVO's Three Fingered Jack Info
• Link to U.S.G.S. Visit a Volcano Info for Three Fingered Jack
• Link to Volcano World's Three Fingered Jack Info