Open File Report O-08-11, Preliminary Geologic Map of the Lebanon and Onehorse Slough 7.5’ Quadrangles, Linn County, Oregon.
The Lebanon and Onehorse Slough 7.5` quadrangles are located in the Willamette Valley of Oregon at the western edge of the Western Cascades physiographic province. Geology depicted on the 1:24,000-scale Lebanon and Onehorse Slough 7.5` quadrangles is based partly on previous 1:62,500-scale mapping by Allison and Felts (1956) and Beaulieu and others (1974). 2008
by Mark L. Ferns and Jason D. McClaughry