Deschutes & Ochoco National Forests
Crooked River National Grassland

Oregon Volcanoes

Davis and Black Rock Vents

SUMMARY

Type: cinder cones and flows
Activity: extinct
Last Eruption: about 5500 yrs ago
Rock Type: andesite
Eruptive Volume: ?
Latitude: 43.49 N to 43.64 N
Longitude: 121.81 W to 121.82 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 of Davis Flows from TopoZone
Topo Map of Black Rock Flows from TopoZone

Photo Menu Davis and Black Rock Vents Photo Menu

GEOLOGIC BACKGROUND:

The Davis and Black Rock Vents include three small Holocene cinder cones and their lava flows. The alignment, composition similarities, and visual similarities indicate that they all probably erupted during the same eruptive period.

• The northern most vent erupted the flows which blocked Odell Creek to form Davis Lake.
• There is an age date about 5,500 yrs (C14 age of 4,740 yrs) on the middle flow which comes from an unnamed cinder cone that has been mined for cinder aggregate material. The mining has exposed the core of the cone.
• The southern flow comes from Black Rock Butte. There is a flat lava floored crater in Black Rock Butte, and there is a small pit crater on the crater floor.
  

HISTORIC ACTIVITY:

• None

DATA SOURCE:

• Jensen
• USGS
  

ADDITIONAL INFORMATION