 | | Journal (article/letter/editorial) | | Wyoming (Table 1) and from near Chimney Rock in southwestern Nebraska (locality 1, Tables 1, 3); the perrierite-bearing...ash in lower part of Arikaree Formation near Chimney Rock, Nebr. B, chevkinite crystal (Spec. No. 66W39)...Pearlette Ash Member, Borchers locality, Meade County, Kans.; glass adhering to edges of crystal. C,...ash in Iower part of Troublesome Formation, Grand County, Colo.; glass adhering to edge of crystal. Photographs...radiationusing 11.5cm camera] Chevkinite Chimney Morrill nU, Rock Co., Nebr. d(.ops), d.(.calc), 001 |  | | Report (volume) | | (occasionally) are younger than K-Ar ages from the same rock led to the discovery (Fleischer and others, 1965b)...Western North America, a vitrophyre of a welded tuff from Wyoming, an obsidian from South America, and...-r-----~ GLASS SHARDS (HYDRATED) CHIMMNEY ROCK, NEBRASKA Sample 1 2, table 6 (!) cc>- ~w 0.,.........z 10 GLASS SHARDS (HYDRATED) SHEEP CREEK. NEBRASKA Sample 10, table 6 N a: 0 w (!) < ~ s w...1972, Geologic map of the Benton quadrangle, Mono County, Camornia, and Esmeralda and Mineral Counties, |  | | Report (issue) | | Miocene Troublesome Formation near Kremmling, Grand County, Colo- 2 2. Sketch map showing distribution of...Middle Park, Colo., and selected areas in Colorado, Nebraska, and Wyoming 10 5. Some reported occurrences...stratigraphic sections of Miocene rocks in western Nebraska and near Kremmling, Colo., showing positions of...Formation of Miocene age near Kremmling, Grand County, Colo 7 2. Petrographic characteristics of selected...selected Miocene ash beds from Colorado, Nebraska, and Wyoming---- 17 3. Chemical analyses of glass |  | | Report (issue) | | Department of Geology University of Nebraska—Lincoln Lincoln, Nebraska 68588-0340 Hannan E. LaGarry Conservation...(IANR) and State Museum University of Nebraska—Lincoln Lincoln, Nebraska 68588-0514 and Robert M. Hunt, Jr...Vertebrate Paleontology University of Nebraska—Lincoln Lincoln, Nebraska 68588 o20 1998 Copyright © 1998...Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, USA, phone (978) 750-8400, http://www.copyright.com...(1899) at the Pine Ridge escarpment in northwestern Nebraska (Roundtop locality). 10°9°8 7 65°94 352 1 il |  | | Report (issue) | | of lithologic units E7 Andesite (Ta) E7 Ash-flow tuff (Tt) E7 Lower basalt (Tbl) E7 Lower tuffaceous sedimentary...The study area contains occurrences of pozzolanic tuff, perlite, and building stone. The sand and gravel...chart), which include andesite lava and tuff breccia, ash-flow tuff, tuffaceous sedimentary rocks, and basalt...and tuffaceous sedimentary rock. The eastern part is underlain by ash-flow tuff, which forms a terrain of...resources in the Spaulding Wilderness Study Area. County mining records show that two groups of mining claims |  | | Journal (article/letter/editorial) | | QUESTIONS AND ANSWERS ABOUT ROCKS ROCK CHIPS R. D I R K T I T A M G I M Questions for this column are...are welcome. Please address all correspondence to "Rock Chips," Rocks and Minerals, 4000 Albemarle Street...Saint Ignace, Michigan): What makes rocks like the Rock of Gibraltar so famous? Answer: Krista, in answering...their shapes rather than because of the kind of rock they are. There are, of course, exceptions to this..." T w o examples of loose boulders are Plymouth Rock, which owes its fame to a historical coincidence |  | Medaris, G. L. J. r., Svojtka, M., Ackerman, L., Cotkin, S. J. (2019) Petrogenetic evolution of a Late Jurassic calc-alkaline plutonic complex, Klamath Mountains Province, U.S.A.: quantification by major- and trace-element modelling. Journal of GEOsciences, 64 (2) 81-103 | Journal (article/letter/editorial) | | Wisconsin–Madison, 1245 West Dayton, Madison, WI 53706, USA; medaris@geology.wisc.edu Institute of Geology of...Czech Republic 6382 Tahoe Rd., Woodbury, MN 55125, USA Corresponding author This investigation illustrates...quartz diorite and granodiorite, comparisons of whole-rock REE patterns with those for melts calculated to...equilibrium with amphibole demonstrate that the whole-rock REE compositions represent a combination of crystals...crustal-scale petrogenetic evolution, the Russian Peak whole-rock and mineral compositions largely record the final |  | | Report (issue) | | (turbidites of flysch characteristics) are the main rock types, with minor pillow basalt (now greenstone)...Carbonaceous detritus (up to 10 volume percent of the rock) and radiolaria of "Jura-Cretaceous age" (written...upper zones and vesicular tops. Silicic ash-flow tuff, rhyolite, and related volcaniclastic rocks, all...between Twin Peaks and Miriam Creek. An unmapped tuff interbedded with the basalt of Hogback Mountain...[650 m]) of upper Pliocene high-silica rhyolitic tuff, flows, and breccias (unit Tpr) the Devils Horns |  | | Journal (article/letter/editorial) | | ....................... 452 Contacts of igneous rock.........................................................................462 Inclusions in igneous rock...................................................extreme rig h t; mountYoung on extreme left (No. 47). Rock basin on top of Nunatak, Muir glacier (No. 8 )....Moraine coming out of main valley (No. 128). Big rock on moraine (No. 131). Another view of cone of round...Faulted gray wacke, shale, and sandstone in young rock series; looking west (No. 249). 93. Valley tributary |  | | Book | | Quarries Formation: State: Upper Harrison Nebraska, NALMA or Sioux Correlative: Radiometric...Quarry Formation: State: NALMA Runningwater Nebraska, Dawes Radiometric Dates: none References:...dakota. Quarry Formation: State: Box Butte, Nebraska, NALMA or General Box Dates: Valley Co....Radiometric General to the Sheep Creek Fn. County. Nebraska, NALMA equivalent Dates: References: ...Formation: State: NALMA 1981 1985b Box Butte Nebraska, Box Butte or Correlative: Radiometric General |  | | Report (issue) | | - - . .... 12 k. Dlagramm. trie section of Ship Rock diatreme and hypothetical extension to depth - -...conduit filling and the surrounding sedimentary rock. Gravity contours associated with an underlying...of Navajo Reservation in Apache County, Arizona and San Juan County, Efew ivfexieo (fig. l). Prominent...include the Carrizo Mountains near the center, Slip Rock to the east, and the Chuska Mountains to the south...geology in this report is limited to the general rock types, densities , and structure as related to their |  | | Book | | collections from White River outcrops in Wyoming, Nebraska, and North Dakota as well. Unlike many collectors...the Geological Society of America in Lincoln, Nebraska, on April 27, 1995, the prevailing refrain from...Walsh: Middle Eocene mammalian faunas of San Diego County, California 75 6. S. L. Walsh, D. R. Prothero,...Formation and Poway Group, southwestern San Diego County, California 120 7. D.R. Prothero and E. H. Vance...middle Eocene Coldwater Sandstone, central Ventura County, California 155 8. D.R. Prothero, J. L. Howard |  | | Report (issue) | | For simplification by AGI the Sections on County Index and Rock Unit Index were merged into a broader Subject...searched by location, i.e. the county or by the subject material or the rock unit name, and of course if...1983-. ISSN: 02634546. International Journal of Rock Mechanics and Mining Sciences. Oxford-New York:...00207624, CODEN: IJRMA2. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts...00741876, CODEN: IAPPC8. Proceedings- Symposium on Rock Mechanics. New York, NY: American Institute of Mining |  | | Book | | Mountains and Hungry Rivers 51 5, * Black Hills and Bent Rock 69 6 « To the Backbone of the Continent 93 7 *...waiting for winter rain. This is a world ruled by rock, dust, and heat, where the land swallows rivers...with its wild beauty, naked mountains, and stunning rock exposures. In the hu- mid East, a cloak of annoying...West was a brooding menace—a fearsome land of sharp rock and little water, a vast and pitiless place where...roots of the grass. Before that, they were in the rock that broke down to make the soil. Before that, the |  | | Report (issue) | | _______________ _ Evacuation Creek Member ______________ _ Tuff beds in the Green River Formation __ _ Tuffaceous...Utah, and about 150 square miles is in Rio Blanco County, Colo. Bound,aries of the irregularly shaped area...thick. The formations in the lower part of this rock sequence thin and pinch out southw~rd toward the... and oolitic, algal and ostracodallimestone and tuff deposited in a lacustrine environment. Thin, even...particularly the madstone, oil shale, siltstone, and tuff that were deposited in water FIGURE 2.-Thin beds |  | | Journal (article/letter/editorial) | | units inwardly zoned from tonalite to granite. Bulk-rock compositions and U-Pb (zircon) ages are consistent...investigations have traditionally relied on bulk-rock geochemical data, including major and trace element...ratios. The common implicit assumption is that bulk-rock compositions represent, or at least closely reflect... on the basis of bulk-rock compositions problematic, unless the principal rock-forming phases can be...major and trace element microanalysis of primary, rock-forming minerals. For example, in feldspars, zoning |  | | Journal (article/letter/editorial) | | 20059, USA Branch, Code 691, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA 3Faculty...(with CRM), and igneous rock 399 © Meteoritical Society, 2003. Printed in USA. 400 G. Kletetschka...fields. This 1% of TRM remanence left in various rock has been noted previously. Cisowski observed that...granite, Quincy, Massachusetts 7.4 5 Aplite, Boulder County, Colorado 6.96 6 Quartz monzonite porphyry, Garfield...Minnesota 7.76 10 Rhyolite tuff, Frying Pan Basin, Montana 14 11 Rhyolite, Castle Rock, Colorado 7.3 12 Rhyolite |  | | Journal (article/letter/editorial) | | Camp Bird mine, level 2, Sneffels district, Ouray County. Raines-Pettem collection, photographer unknown...with another 50 million pounds mined in San Juan County (Henderson 1926). During the twentieth century...are limited to the Red Mountain district in Ouray County. Figure 2. Colorado mineral belt (COMB) with copper...deposits are located outside the COMB mainly in Baca County, in the southeastern part of the state. Precambrian...containing suites of metamorphic and igneous Precambrian rock. The nature and timing of mineralization for these |  | | Report (issue) | | the west flank of the East Tintic Mountains, Juab County, Utah .......... Location of map areas in the...semicircular depression filled with at least 1 km of tuff and lacustrine siltstone (lower and upper pyroclastic...pyroclastic sequences); (4) eruption of postcaldera latite tuff, possibly during an early episode of resurgence...quartz latite porphyry. Thin deposits of unwelded tuff occur locally near the base of the unit; these contain...clear sanidine are far more abundant in the Fernow tuff. Eutaxitic textures are widespread; partial welding |  | | Book | | Frontispiece: The artistry of erosion, Balanced Rock, Arches National Park, Utah Library of Congress...Painted Spires 105 Hike 14. Monument Valley: Red Rock Buttes and Mesas 109 Hike 15. Coyote Buttes: Exhumed...The Bridges of White Canyon 131 Fisher Towers: Red Rock Towers of Conglomerate 137 Hike 18. Hike 19. 4...THE SOUTHEASTERN HIKES PLATEAU 229 230 Ship Rock: Rocks from the Deep 234 Bisti Badlands: Fantasy...Shorelines 239 Hike 47. Ghost Ranch: New Mexico’s Red Rock Country 242 Hike 48. Frijoles Canyon: Waterfalls |  | | Book | | .... 56 Sphinx Mountain and The Helmet Basement Rock on the Rise ......................................Volcano Erupts Again! .. ........................ 143 Tuff Sn1others the Region and a Caldera Forms 13. The...volcano-the Yellowstone Volcano. ParLially molLen rock, called magma, exists as little as 2 miles (a liule...visualize Earth as an egg. The very outer layer of rock, the shell, is called the crust. The mantle, or...that over long periods of ti1ne, hot pressurized rock of the mantle actually deforms like a slowly moving |  | | Report (volume) | | Early, Middle, and Late, and for epochs. Informal rock terms lower, middle, and upper may be used where...of all words used in forming the names of formal rock-stratigraphic units be capitalized. All the geologic...or 11 late," if used by an author with the age of rock units, is changed to 11lower" or 11upper." The age...Bull. 1060-D, p. 193, 252-253, pl. 7. In Nemaha County, Kans., member is basal unit of Howard limestone...Aarde farm, sec. 4, T. 26 S., R. 11 E., Greenwood County. Aaron Slatet Precambrian or Paleozoic: Central |  | | Report (issue) | | _______________________________________ _ Chemical (rapid rock) analyses of very fine grained clastic rocks from...those presently exposed in the Elkhorn Mountains of rock-derived predominantly from the western volcanic...Union contain igneous, metamorphic, and sedimentary rock fragments ]!"'ormation. This continuous sequence...Beartooth Range in east-central Gallatin County and west-central Park County, southwestern Montana (fig. 1). The...GEOLOGIC SETTING The distribution of outcropping rock units in the Livingston area, as shown on plate |  | | Journal (article/letter/editorial) | | It also occurs in the groundmass of these general rock types, is a product of deuteric alteration, and...the railroad tunnels through Bergen Hill, Bergen County, and similar specimens have been collected in railroad...Weehawken areas and quarries at Snake Hill, Hudson County. Exceptional analcime specimens have been collected...collected from many localities in Passaic County, such as quarries at Paterson and West Paterson (including...Montclair and Verona in Essex County, the Houdaille quarry at Summit in Union County, and quarries near Millington |  | | Report (volume) | | Pelahatchie, and at Brandon ; but south of Morton, Scott County, just east of the area, a hillcrest is 631 feet...the "gas rock." A few wells near Jackson have been drilled through the base of the gas rock to enter...igneous rock including varieties of nepheline syenite, lamprophyre, aplite, and sanidine-calcite rock. A few...few wells have been drilled through the gas rock into black clay, presumably a lake deposit, underlain...GEOLOGY OF THE JACKSON AREA, MISSISSIPPI The gas rock consists of 280(?) to 500 feet of very pure calcium |
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