"It is the purpose of this paper, through a brief review of the history of Astoria, to construct a framework of the physical history of the city, to place each published geologist in his correct historical setting within the city, and to reestablish his locales so as to be presently...
Clay minerals from sediment samples obtained on Astoria Fan
were analyzed by X-ray diffraction. Clay minerals are defined for
the purpose of this study as crystalline phyllosilicates less than two
microns in equivalent settling diameter. The clay minerals are subdivided
into the five common families: montmorillonite, chlorite,
vermiculite, illite, and...
This is the second report of a study designed to establish the
current patterns and water mass characteristics existing along the
Oregon coast. Surveys reported on previously were concerned with
monthly samples from a maximum depth of 100 feet and out to 25 miles
offshore from Newport, Oregon. Since December...
There are seven stratigraphic units exposed in the Picture
Gorge quadrangle, a 204-square mile area in east-central Oregon.
isolated exposures of pre-Cretaceous serpentinites, metalimestones,
and other metamorphic rocks record marine deposition
of sands silts, and limy sediments followed by burial, lithification,
peridotite intrusion, and several periods of deformation. Intrusion
The Molalla quadrangle is located in northwestern Oregon along the eastern edge of Willamette Valley about 30 miles south of Portland. The area includes part of the Western Cascade foothills as well as a portion of the Willamette Valley lowland. The rocks in the Cascade foothills are marine and terrestrial...