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Waldo Hills
The Waldo Hills are a range of hills in the Willamette Valley of Oregon, United States. Encompassing an area of around , the hills are located east of Salem.〔Corning, Howard M. ''Dictionary of Oregon History''. Binfords & Mort Publishing, 1956.〕 The hills are named after pioneer Daniel Waldo.
==Geology==
The hills stretch out from Mill Creek in a northeasterly direction.〔 These hills were formed by a cuesta of Columbia River Basalt Group.〔Yeats, Robert. (Tectonic Setting of the Willamette Valley. ) Geological Society of America , Accessed September 10, 2007.〕 Rocks of the hills include Tertiary volcanic bedrock, sedimentary bedrock, and Plio-Pleistocene sedimentary basin fill shaped by elongate domical folds.〔Terry L. Tolan and Marvin H. Beeson. (Geologic Map of the Scotts Mills, Silverton, and Stayton Northeast 7.5 Minute Quadrangles, Oregon. ) United States Geological Survey, 1999.〕 The Waldo Hills form part of the divider between the upper and lower Willamette Valley.〔 Additionally, the Waldo Hills as part of a larger fault system of low-lying hills in the mid-valley, are the largest geological structure in the mid-Willamette Valley.〔 Along with the Silverton Hills, these hills form the foothills to the Cascade Mountains to the east.〔
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