Title: Vegetation of Oregon and Washington
Identifier: CAT92272720 (find matches)
Year: 1969 (1960s)
Authors: Franklin, Jerry F. cn; Dyrness, C. T
Subjects: Botany Oregon Ecology; Botany Washington (State) Ecology
Publisher: Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Figure 17. — Lava Butte south of Bend, Oregon — an outstanding example of a Recent volcanic cone and associated lava flows located in the western portion of the High Lava Plains province. Quaternary valley fill deposits overlie the older volcanic flows. These are comprised of alluvium and lake deposits plus eolian sedi- ments, all of which were derived from the vol- canic rocks of the uplands. Evidences of extensive volcanic activity during Pleistocene and Recent times are abun- dant, especially in the western portion of the province. The largest volcanic peak is the Paulina Peak shield volcano which contains Newberry Crater. Pumice, resulting from an eruption of this volcano about 4,000 years ago, mantles an extensive area to the north and east of the crater. Deposits of Mount Mazama pumice are also widespread in the same general area, as well as to the south in the Basin and Range province. Broad areas of Pleistocene lava flows are a notable feature in the vicinity of Bend. In addition, several out- standing examples of Recent lava flows are situated south of Bend at Lava Butte (fig. 17) and east of Fort Rock. Soils of the High Lava Plains province are similar to those occurring in the Basin and Range and Owyhee Upland provinces to the south and east. The central and eastern por-

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