Waldo Hills

Encompassing an area of around 50 square miles (130 km2), the hills are located east of Salem.

[1] These hills were formed by a cuesta of Columbia River Basalt Group.

[2] Rocks of the hills include Tertiary volcanic bedrock, sedimentary bedrock, and Plio-Pleistocene sedimentary basin fill shaped by elongate domical folds.

[3] The Waldo Hills form part of the divider between the upper and lower Willamette Valley.

[1] Later settlers included Homer Davenport and Samuel L. Simpson, along with Waldo's sons John and William.