Pomona Member of the Columbia River Basalt Group: an intracanyon flow in the Columbia River Gorge, Oregon.
Oregon Geology
By: J. L. Anderson
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Abstract
The Pomona Member of the Saddle Mountains Basalt (Columbia River Basalt Group) occurs as an intracanyon flow greater than 75m (250ft) thick along the S side of the Columbia River Gorge between Mitchell Point and Shellrock Mountain, Oregon. Best exposures are at Mitchell Point, where this flow caps more than 70m (230ft) of cobble conglomerate that partially fills a canyon cut into flows of the underlying Frenchman Springs Member. These exposures provide a necessary link between outcrops of the Pomona Member in the Columbia Plateau and western Washington. Post-Frenchman Springs, pre-Pomona canyon cutting implies deformation in the ancestral Cascade Range between about 14.5 and 12Ma ago.-Author
Suggested Citation
Anderson, J.L., 1980, Pomona Member of the Columbia River Basalt Group: an intracanyon flow in the Columbia River Gorge, Oregon.: Oregon Geology, v. 42, no. 12, p. 195-199.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Pomona Member of the Columbia River Basalt Group: an intracanyon flow in the Columbia River Gorge, Oregon. |
| Series title | Oregon Geology |
| Volume | 42 |
| Issue | 12 |
| Year Published | 1980 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Oregon Geology |
| First page | 195 |
| Last page | 199 |