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Rak Tuff

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Journal Article
Journal: GSA Bulletin
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
Journal: GSA Bulletin
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
Journal: Economic Geology
Published: 01 June 2009
Economic Geology (2009) 104 (4): 505–520.
... al., 1985 ; North and McLemore, 1985 ; North and Tuff, 1986 ; Bohlke and Irwin, 1992 ; Hill, 1994 ; Hill et al., 2000 ), we propose the following petrogenesis and paragenetic history of the Rio Grande rift fluorite-barite-galena deposits as represented schematically in Figure 7 . Fluid inclusion...
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Journal Article
Published: 01 July 2008
Russ. Geol. Geophys. (2008) 49 (7): 492–502.
..., and alkalis. South of the plateau there are two zones: (i) stratified tuffaceous rocks with variable amounts of lava flows in the upper section and, farther to the south, small basins between fissure and brecciated dome volcanic edifices with redeposited tuff material; still farther southward there are (ii...
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Journal Article
Published: 01 July 2010
Journal of the Geological Society (2010) 167 (4): 817–825.
... 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 Ma). The silicified ostracodes therefore probably date to the latest Burdigalian, although...
FIGURES
Journal Article
Journal: GSA Bulletin
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...
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Image
Figure 2. Schematic stratigraphic sections. All age uncertainties are shown...
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
Journal: GSA Bulletin
Published: 01 March 2005
GSA Bulletin (2005) 117 (3-4): 276–287.
...) 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...
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Series: Geological Society, London, Geology of Series, Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.2
EISBN: 9781862393882
... geographically restricted strike-slip basins (Pharaoh et al. 1987a; Nance et al. 1991; McΙlroy et al. 1998; Hartz & Torvik 2002; Fig. 2.3 ). This unexposed terrane is the most easterly expression on the British Avalonian and is characterized by limited data from acid ash-flow tuffs from the Glinton...
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Journal Article
Published: 19 February 2016
Journal of the Geological Society (2016) 173 (4): 628–633.
... in hyolith conchs . Memoirs of the Association of Australasian Palaeontologists , 37 , 481 – 489 . Fatka , O. , Lerosey-Aubril , R. , Budil , P. & Rak , Š. 2013 . Fossilised guts in trilobites from the Upper Ordovician Letná formation (Prague Basin, Czech Republic) . Bulletin...
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Journal Article
Published: 30 January 2018
The Canadian Mineralogist (2018) 56 (1): 15–37.
...; Diella, V. (2011) Demantoid and topazolite from Antetezambato, northern Madagascar: review and new data . Gems and Gemology 47 , 2 – 14 . Rák, Z.S., Ewing, R.C., &...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2004
GSA Bulletin (2004) 116 (11-12): 1529–1544.
... represents the last major lacustrine episode in the area. An anorthoclase-phyric tuff exposed <1 m below the disconformity at Gona yielded a 40 Ar/ 39 Ar age of 2.92 ± 0.006 Ma and has been correlated with tuff BKT-2L in the Hadar area ( Semaw et al., 1997 ). The total thickness of the Kada Hadar...
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Journal Article
Published: 19 June 2015
Geological Magazine (2015) 152 (5): 942–948.
...-Lagerstätte of South Australia . Journal of Paleontology 86 , 340 –57. Rak Š. , Ortega-Hernández J. & Legg D. A. 2013 . A revision...
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Journal Article
Published: 01 July 2001
Journal of Paleontology (2001) 75 (4): 890–894.
... of granite and sandstone conglomerate, 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...
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Journal Article
Published: 01 July 2020
Journal of Paleontology (2020) 94 (4): 681–695.
..., 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. The Karazhirik horizon bears several dalmanitids type species such as Kasachstania...
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Journal Article
Journal: PALAIOS
Published: 30 April 2020
PALAIOS (2020) 35 (4): 175–190.
... Hills: the Owl Conglomerate, Middle, and Upper members ( Fig. 2 ; Woodburne et al. 1990 ). It has been 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...
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Journal Article
Journal: Geosphere
Published: 01 December 2008
Geosphere (2008) 4 (6): 976–991.
... (biotite) of a tuff bed near the top of the Hualapai Limestone ( Spencer et al., 2001a ). The Colorado River arrived at the head of the early Pliocene Gulf of California by ca. 5 Ma, as evidenced by 40 Ar/ 39 Ar ages of 5.51 ± 0.13 Ma (sanidine) of a tuff bed underlying the Bouse Formation midway...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2005
GSA Bulletin (2005) 117 (7-8): 846–864.
.... 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′ crosses the top of the flood volcanic group, which remains undated...
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Journal Article
Journal: GSA Bulletin
Published: 20 November 2018
GSA Bulletin (2019) 131 (5-6): 730–748.
... and one tuff from the Yaw Formation and four sandstones from the Letkat Formation. Detailed analytical protocols and information about the data reduction schemes are provided in the supplementary methods. Briefly, zircon crystals were extracted by traditional methods of heavy mineral separation, including...
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Journal Article
Published: 01 July 2012
Journal of the Geological Society (2012) 169 (4): 489–500.
... a K–Ar age of 74 ± 2 Ma and suggested this was a Cretaceous emplacement age. Ghani et al. (1999) found evidence for an older garnet-bearing granite series on Tioman Island. Also present are felsic to intermediate volcanic rocks, both lavas and tuffs. Liew (1983) and Liew & McCulloch (1985...
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