USGS Science⌕ Search
Home/Archive/USGS

USGS · 70012227

Miocene stratigraphy and fossils, Cape Blanco, Oregon.

W.O. Adicott
View original source ↗Export metadata ↓

Abstract

A summary of the stratigraphic occurrence of the Miocene molluscan faunas exposed in marine sandstone seacliffs on the SW Oregon coast. The more common and biostratigraphically significant species are illustrated. - Philip Harris

Explore related subjects

Oregon GeologyArticle

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

W.O. Adicott. 1980. Miocene stratigraphy and fossils, Cape Blanco, Oregon.. https://pubs.usgs.gov/publication/70012227

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related USGS reports

USGS1993

Klamath Falls earthquakes, September 20, 1993 — Including the strongest quake ever measured in Oregon

Earthquakes struck the Klamath Falls area on Monday night, September 20, 1993, resulting in two deaths and extensive damage. The quakes were felt as far away as Coos Bay to the west, Eugene to the north, Lakeview to the east, and Chico, California, to the south. A foreshock recorded at 8:16 p.m. had a Richter magnitude of 3.9. The first of two main shocks, measuring 5.9 on the Richter scale, rumbled through Klamath Falls at 8:28 p.m. Following 16 smaller jolts with magnitudes between 2.2 and 3.8, the largest quake struck at 10:45 p.m. This earthquake, measuring 6.0 on the Richter scale, is the largest to hit Oregon since the 1873 Port Orford/Crescent City earthquake (Jacobson, 1986). Oregon has been shaken by stronger quakes, but those quakes originated beneath the Pacific Ocean west of Port Orford.

California, Nevada, Oregon, Washington↗
USGS1980

Pomona Member of the Columbia River Basalt Group: an intracanyon flow in the Columbia River Gorge, Oregon.

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

Oregon Geology↗