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Creator:: Oregon. Dept. of Geology and Mineral Industries, Vallier, T. L. (Tracy L.), Brooks, Howard C., and Mason, Ralph S.
Resource Type:: Journal
Full Text:: March 1970 • GEOLOGY AND COPPER DEPOSITS OF THE HOMESTEAD AREA, OREGON AND IDAHO By Tracy L

Creator:: Oregon. Dept. of Geology and Mineral Industries and Munts, Steven R.
Abstract:: The platinum-group metals have been the subject of considerable discussion in the news media over the past few months, particularly because of their projected use as catalysts in automobile engines. Metals Week of August 27 shows that platinum commands a price of $176.00 per ounce, as compared to $150.00 per...
Resource Type:: Journal
Full Text:: when Executive Order L-208 closed down prac- tically all of the gold mines in the country. The future

Creator:: Oregon. Dept. of Geology and Mineral Industries, Boggs, Sam, and Hull, Donald A.
Resource Type:: Journal
Full Text:: . A typical "glendonite" has the approximate crystal form of a slender, elongate, rhombic prism with

Creator:: Oregon. Dept. of Geology and Mineral Industries, Nelson, Dennis O., and Shearer, Gerald Brian
Resource Type:: Journal
Full Text:: occur in a thick unit of crystal vitric tuff which is highly weathered and very friable (figure 4

Creator:: Oregon. Dept. of Geology and Mineral Industries and Boggs, Sam
Resource Type:: Journal
Full Text:: 11 Lc) ° L‘) °. Lo N N ,j 0 0 0 0 LO 0 , t.0 L M d O cni 0 o In LC) LC) In o In Lc) (Ni 1

Creator:: Oregon. Dept. of Geology and Mineral Industries, Peterson, Norman V., Ramp, Len, and Geological Society of America Penrose Conference (1972 : Portland, Or., etc.)
Resource Type:: Journal
Full Text:: parallel to the direction of per- fect cleavage in the feldspar crystal, so the glittering reflection is

Creator:: Oregon. Dept. of Geology and Mineral Industries, Purdom, William B., and Lund, Ernest H.
Resource Type:: Journal
Full Text:: various sizes in all stages of digestion. The most abundant crystal fragments are those of feldspar

Creator:: Oregon. Dept. of Geology and Mineral Industries and Kays, Marvin Allan, 1934-
Abstract:: This report summarizes results of geologic mapping in the South Umpqua Falls region of the Western Cascade Range in Douglas County, southwestern Oregon (plate 1). Rocks of the Western Cascades range in age from late Eocene to late Miocene and consist of deformed and partially altered flows, pyroclastic rocks, and...
Resource Type:: Journal
Full Text:: others (1964). 89 A I -13 I o 11) 41) C I C x •7 I uci).z -0 • - 5 07 0 -„,n8.08 • L

Creator:: Oregon. Dept. of Geology and Mineral Industries and Walker, George Walton, 1921-
Abstract:: Periodic violent eruptions from many different centers during Cenozoic time deposited vast quantities of pyroclastic material as ash-flow tuffs over most of Oregon, although the Coast Ranges and isolated patches elsewhere in the state appear to have been spared these recurring inundations. Eruptions occurred at different times throughout the Cenozoic,...
Resource Type:: Journal
Full Text:: ash or pumice and crystal fragments in tuffs and tuffaceous sediments. A large part of this material

Creator:: Oregon. Dept. of Geology and Mineral Industries, Folsom, Michael M., and Staples, Lloyd William, 1908-
Resource Type:: Journal
Full Text:: . Pubs. 1087. Holmes, Kenneth L., 1955, Mount St. Helens' recent eruptions: Oreg. Hist. Quart., v. 56, p

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