The Geology of Crater Lake National Park, Oregon With a reconnaissance of the Cascade Range southward to Mount Shasta by Howell Williams Microscopic Petrography Andesites of Mount Mazama and Scott Andesites of the Hillman Vent The conduit of the Hillman cine is mainly occupied by vesicular, pale-gray, pilotaxitic pyroxene andesite. Not only is … Continue reading 129 Andesites of Mount Mazama and Scott – Andesites of the Hillman Vent →
The Geology of Crater Lake National Park, Oregon With a reconnaissance of the Cascade Range southward to Mount Shasta by Howell Williams Microscopic Petrography Andesites of Mount Mazama and Scott Basic Inclusions in the Andesites In the Lassen region, basic inclusions (autoliths) are particularly abundant in the dacites and rare among the andesites. … Continue reading 128 Andesites of Mount Mazama and Scott – Basic Inclusions in the Andesites →
The Geology of Crater Lake National Park, Oregon With a reconnaissance of the Cascade Range southward to Mount Shasta by Howell Williams Microscopic Petrography Andesites of Mount Mazama and Scott The bulk of Mount Mazama and the whole of Mount Scott are composed of hypersthene andesites. Since they do not differ materially from the … Continue reading 127 Microscopic Petrography – Andesites of Mount Mazama and Scott →
The Geology of Crater Lake National Park, Oregon With a reconnaissance of the Cascade Range southward to Mount Shasta by Howell Williams Microscopic Petrography The Younger Dacite Flows Dacites of Cloudcap and Scott Bluffs On the map, plate 3, all the lavas of Cloudcap and Scott Bluffs have been classed as dacite. It must … Continue reading 138 Microscopic Petrography – The Younger Dacite Flows – Dacites of Cloudcap and Scott Bluffs →
The Geology of Crater Lake National Park, Oregon With a reconnaissance of the Cascade Range southward to Mount Shasta by Howell Williams The Formation of Mount Mazama Just before Its Destruction THE remnant slopes of Mount Mazama show the concave profile typical of composite volcanoes, and it may be assumed with confidence that the … Continue reading 61 The Formation of Mount Mazama Just before Its Destruction →
The Geology of Crater Lake National Park, Oregon With a reconnaissance of the Cascade Range southward to Mount Shasta by Howell Williams The Structural Setting of Mount Mazama IN THE part of the Cascade Range shown on the map (plate 2), the pre-Pliocene volcanic rocks dip, in general, toward the east and northeast beneath the … Continue reading 24 The Structural Setting of Mount Mazama →
Mount Mazama and Crater Lake: Growth and Destruction of a Cascade Volcano U.S. Geological Survey and the National Park Service USGS Fact Sheet 092-02, August 2002
DESCRIPTION: Mazama Ash — from the USGS/Cascades Volcano Observatory website Plot of thickness vs. distance from vent for several tephras from Cascade Range volcanoes; Modified from: Hoblitt, et.al., 1987, USGS Open-File Report 87-297 From: Hoblitt, Miller, and Scott, 1987, Volcanic Hazards with Regard to Siting Nuclear-Power Plants in the Pacific Northwest: USGS Open-File Report 87-297 … Continue reading Description Mazama Ash, USGS, Cascades Volcano Observatory, Hoblitt, Miller, and Scott, 1987 →
The Geology and Petrography of Crater Lake National Park, 1902 PART I. MOUNT MAZAMA. DEVELOPMENT OF MOUNT MAZAMA. Scott Peak is only a large cone adnate to Mount Mazama. It belongs to the same center and holds essentially the same relation to it as Shastina does to Shasta. The slopes of Mount Mazama reach to … Continue reading 43 Development of Mount Mazama →
The Geology and Petrography of Crater Lake National Park, 1902 PART I. MOUNT MAZAMA. GLACIATION OF MOUNT MAZAMA. The glaciers of Mount Mazama have left distinct records in the form of striae and moraines, with their outwash plains lower down upon the mountain slopes. The radial arrangement of the striae across the very crest of … Continue reading 41 Glaciation of Mount Mazama →
