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1-20 OF 38 RESULTS FOR
Rak Tuff
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Journal Article
Lithostratigraphy, biostratigraphy, and geochronology of the Barstow Formation, Mojave Desert, southern California Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 April 1990
GSA Bulletin (1990) 102 (4): 459–477.
... chron C5C. The uppermost breccias of the Pickhandle Formation are younger than 19.3 m.y. and are likely older than 16.3 m.y., the age of the Rak Tuff that locally caps the Owl Conglomerate Member. The middle member of the Barstow Formation lies stratigraphically above the Owl Conglomerate Member...
Journal Article
Paleomagnetism, geochronology, and possible tectonic rotation of the middle Miocene Barstow Formation, Mojave Desert, southern California Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 April 1990
GSA Bulletin (1990) 102 (4): 478–493.
... conventional 40 K- 40 Ar and 40 Ar/ 39 Ar single-crystal laser-fusion methods. Multiple analyses on minerals from 5 superposed tuffs yielded the following mean 40 K- 40 Ar ages: Rak Tuff at 16.3 ± 0.3 m.y., Oreodont Tuff at 15.9 ± 0.2 m.y., Dated Tuff at 14.8 ± 0.2 m.y., Hemicyon Tuff at 14.0 ± 0.1 m.y...
Journal Article
Using U-Pb ages of Miocene tufa for correlation in a terrestrial succession, Barstow Formation, California Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 March 2005
GSA Bulletin (2005) 117 (3-4): 276–287.
... the U-Pb systematics of Cenozoic nearsurface deposits including organicrich peat (Rowe et al., 1997), speleothem calcite ( Richards et al., 1998 ), secondary silica ( Neymark et al., 2000 , 2002 ), and coral aragonite ( Getty et al., 2001 ). The Rak Tuff lies at the base of the middle member...
Image
Figure 2. Schematic stratigraphic sections. All age uncertainties are shown... Available to Purchase
in Using U-Pb ages of Miocene tufa for correlation in a terrestrial succession, Barstow Formation, California
> GSA Bulletin
Published: 01 March 2005
) Hell Gate Basin section and preferred age of the Lapilli Sandstone ( MacFadden et al., 1990 ). (D) Steep-side Quarry section from Coon Canyon and preferred age of the Oreodont Tuff ( MacFadden et al., 1990 ). (E) Rainbow Basin section and preferred ages of the Red, Rak, and Dated Tuffs ( MacFadden et
Journal Article
Exceptionally preserved ostracodes from a Middle Miocene palaeolake, California, USA Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 July 2010
Journal of the Geological Society (2010) 167 (4): 817–825.
... provided a basis for geochronology ( Woodburne et al . 1990 ). The base of the ‘Middle' Member is locally defined by the Rak Tuff (16.3 ± 0.3 Ma). The concretions that bear ostracodes with soft tissues occur 62.5 m above the Rak Tuff, and approximately halfway between it and the Oreodont Tuff (15.8 ± 0.3...
Journal Article
Survival of Burgess Shale-type animals in a Middle Ordovician deep-water setting Available to Purchase
Thomas W. Hearing, David A. Legg, Joseph P. Botting, Lucy A. Muir, Patrick McDermott, Stephanie Faulkner, Adam C. Taylor, Martin D. Brasier
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 19 February 2016
Journal of the Geological Society (2016) 173 (4): 628–633.
... ), globally correlated to the international Middle Ordovician Darriwilian Stage ( Fortey et al . 2000 ). The Llanfallteg Formation contains siliciclastic and volcaniclastic sediments interbedded with welded lapilli-tuffs. The siliciclastic units comprise massive lenticular or discontinuously laminated...
Journal Article
Origin and Evolution of Oscillatory Zoned Garnet from Kasva Skarn, Northeast Tafresh, Iran Available to Purchase
Hassan Mirnejad, Mahbobeh Hasannejad, Nathan Miller, Jamshid Hassanzadeh, Rosangela Bocchio, Soroush Modabberi
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 30 January 2018
The Canadian Mineralogist (2018) 56 (1): 15–37.
... subducted beneath the Iranian plate (Stöcklin 1968, Alavi 1994). The regional stratigraphy ( Fig. 1 ) involves: (1) Eocene volcanosedimentary rocks, consisting of intercalated tuff, rhyolite, and limestone; (2) Miocene granitoids (diorite-quartz diorite and granodiorite); and (3) nummulite-bearing Upper...
Journal Article
Paleoenvironments of the earliest stone toolmakers, Gona, Ethiopia Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 November 2004
GSA Bulletin (2004) 116 (11-12): 1529–1544.
.... The total thickness of the Kada Hadar Member is 20 m along the Ounda Gona and Kada Gona and ∼30 m to the southwest, along the Dana Aouli, Busidima/Asbole drainages. The base of the lower Kada Hadar Member is marked by the Kada Hadar Tuff, 40 Ar/ 39 Ar dated at 3.18 Ma ( Walter, 1994 ). The Kada Hadar Tuff...
Journal Article
CALICOVATELLUS PETRODYTES , A NEW GENUS AND SPECIES OF PRIMITIVE VATELLINE DIVING BEETLE (COLEOPTERA: DYTISCIDAE: HYDROPORINAE: VATELLINI) FROM THE MIOCENE BARSTOW FORMATION, SOUTHERN CALIFORNIA, USA Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 July 2001
Journal of Paleontology (2001) 75 (4): 890–894.
..., containing the Red division fauna of fossil mammals ( Woodburne et al., 1990 ). The middle comprises coarse-grained fluvial and flood deposits from sources to the south and southwest. It contains fossil mammals of the Rak Division Fauna and Green Hills Fauna ( Woodburne et al., 1990 ). The nodules containing...
Journal Article
A late surviving xenopod (Arthropoda) from the Ordovican Period, Wales Available to Purchase
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 19 June 2015
Geological Magazine (2015) 152 (5): 942–948.
... and welded lapilli-tuffs. Volcaniclastic material likely derives from the rhyolitic
arc volcanoes of Eastern Avalonia (Brenchley et al. 2006 ). The Cat's Hole Quarry biota is dominated by
graptolites, particularly Didymograptus artus , and includes expansograptids...
Journal Article
Ore Genetic Significance of Geochemical Trends During Progressive Migmatisation Within Part of the Singhbhum Shear Zone, Bihar Available to Purchase
Publisher: Geological Society of India
Published: 01 March 1972
Jour. Geol. Soc. India (1972) 13 (1): 39–50.
... metavolcanics within the shear zone such as the chlorite schists and chlorite-biotite-muscovite schists 'Vhich are considered to be related to the Dhanjori lavas (and tuffs). The primary source of uranium is uncertain. It may have been partly derivec through the partial melting of the granitic rocks at depth...
Journal Article
Liquid-Phase Xylene Adsorption in Unary, Binary, and Ternary Solute Systems Using Raw and Ni 2+ Ion-Exchanged Clinoptilolite: Experimental Study and Thermodynamic Assessment Available to Purchase
Journal: Clays and Clay Minerals
Publisher: Clay Minerals Society
Published: 01 February 2020
Clays and Clay Minerals (2020) 68 (1): 38–49.
... (Rasouli et al. 2012 ; Chen et al. 2018 ). Clinoptilolite, as a natural zeolite, has many advantages for industrial and environmental applications. It is abundant and occurs in high-purity tuffs, it possesses inherent inorganic binders which impart suitable mechanical properties, and it is amenable...
Journal Article
Initiation and evolution of forearc basins in the Central Myanmar Depression Available to Purchase
Fulong Cai, Lin Ding, Qinghai Zhang, Devon A. Orme, Honghong Wei, Jinxiang Li, Ji’en Zhang, Than Zaw, Kyaing Sein
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 14 October 2019
GSA Bulletin (2020) 132 (5-6): 1066–1082.
... Ma in both Minbu and Chindwin sub-basins. The Paleocene slope environment Paunggyi Formation, which overlies the Kabaw Formation, mainly consists of conglomerate, sandstone, mudstone, and tuff beds in the Minbu sub-basin. In contrast, the Paunggyi Formation in the Chindwin sub-basin is composed...
Journal Article
Paleosol-derived paleoclimate and paleoenvironment reconstruction of the Rukwa Rift Basin, Tanzania: implications for faunal dispersal in the Miocene–Pliocene Available to Purchase
Theresa J. Orr, Eric M. Roberts, Michael I. Bird, Cassy Mtelela, Patrick M. O'Connor, Nancy J. Stevens
Journal: Journal of Sedimentary Research
Publisher: SEPM Society for Sedimentary Geology
Published: 16 June 2023
Journal of Sedimentary Research (2023) 93 (5): 309–326.
... Mtelela et al. (2017) informally divided into a basal member A and overlying member B ( Fig. 2 ). Generally, member A of the LLB unit comprises a basal quartz-rich conglomerate, an intermediate interval of tuffaceous conglomerates, bentonitic mudstones and tuffs, and an upper part of quartz-rich...
Journal Article
A taxonomic revision of the Early Devonian dalmanitid trilobite Kasachstania Maksimova, 1972 from central Kazakhstan Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 July 2020
Journal of Paleontology (2020) 94 (4): 681–695.
...., 2014 ). The Karazhirik horizon is represented by green-colored various-grained sandstones, siltstones, argillites, shales, bluish-gray ashy tuffs, and lens-like layers of light reef-related limestones of very uneven thickness. The total thickness of the Karazhirik horizon ranges from 500 to 2,400 m...
Journal Article
THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA Available to Purchase
Journal: PALAIOS
Publisher: SEPM Society for Sedimentary Geology
Published: 30 April 2020
PALAIOS (2020) 35 (4): 175–190.
... dated through biostratigraphy ( Woodburne et al. 1990 ; Pagnac 2009 ), magnetostratigraphy ( MacFadden et al. 1990 ; Woodburne 1996 ), and radiometric dating of airfall tuffs ( Woodburne et al. 1990 ; Miller et al. 2010 ; Miller et al. 2013 ). In the Mud Hills, the Barstow Formation ranges in age...
Journal Article
Age determination of oriented rutile inclusions in sapphire and of moonstone from the Mogok metamorphic belt, Myanmar Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 November 2021
American Mineralogist (2021) 106 (11): 1852–1859.
... on the moonstone was carried out using a Micromass MM-5400 spectrometry at CUGB. The J factor was estimated by repeated analyses of Fish Canyon Tuff sanidine, with an age of 27.55 ± 0.08 Ma and of the ZBH biotite, a Chinese standard with an age of 133.3 ± 0.24 Ma ( Wang et al. 2011 and references therein), with 1...
Journal Article
Heavy mineral provenance and paleomagnetic studies of Mesozoic rocks in the Gold Beach terrane, southwestern Oregon, USA Available to Purchase
Ericka M. Boudreau, Richard M. Gaschnig, Jeffrey D. Vervoort, Joshua J. Schwartz, Bernard Housen, Basil Tikoff
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 08 January 2025
GSA Bulletin (2025) 137 (5-6): 2565–2595.
... reply by highlighting distinct welded tuffs in Otter Point conglomerates—lithologies not present in the Klamath Mountains ( Bourgeois and Dott, 1987 ). Additionally, the reply addresses limitations of using conglomerate clast compositions in regional provenance studies, as well as flaws...
Journal Article
Kinematic evolution of the central Andean retroarc thrust belt in northwestern Argentina and implications for coupling between shortening and crustal thickening Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 26 April 2022
GSA Bulletin (2023) 135 (1-2): 81–103.
... ; McQuarrie and DeCelles, 2001 ; McQuarrie, 2002 ; Elger et al., 2005 ; Arriagada et al., 2006 ; Ege et al., 2007 ; Barnes et al., 2008 ; Pearson et al., 2013 ; DeCelles et al., 2015a ; Eichelberger et al., 2015 ; Anderson et al., 2017 , 2018 ; Rak et al., 2017 ; Henriquez et al., 2019 , 2020...
Journal Article
Evolution of a volcanic rifted margin: Southern Red Sea, Ethiopia Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 01 July 2005
GSA Bulletin (2005) 117 (7-8): 846–864.
... of rhyolitic centers at least 400 m thick: the Insertu formation. The Insertu formation overlies the lower Miocene Birkitu basalt formation. The Insertu formation intrudes and is overlain by further ignimbrite and tuff units of the Shewa Robit formation (Fig. 10) . The western side of Profile F–F...
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