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John Day Ecological Province

The rugged north-central area of Oregon.  it is characterized by extensive, geologically eroded steeply dissected hills of thick, ancient sedimentary materials interspersed with buttes and plateaus capped with basalt or tuffaceous rock.  Elevations range from about 1,000 feet in the northwest corner to 7,360 feet at Fields peak in the Ochoco Mountains.

Geologically eroded ancient lacustrine materials capped with basaltic or tuffaceous rock are typical.

General view of John Day Province showing round-top hills, remnants of basalt flows and exposed ancient sediments.

A managed natural shrub-grassland on which basin wildrye (the light-color vegetation) is growing in colluvial soils on uplands near Waterman Flat, Wheeler County.

Information and photos from: Anderson, E.W., Borman, M.M., and Krueger, W.C. 1998. The ecological provinces of Oregon: A treatise on the basic ecological geography of the state. Oregon Agricultural Experiment Station. SR 990. Corvallis, Oregon, USA.