Radiolarian biostratigraphy of the Quinn River Formation, Black Rock Terrane, north-central Nevada; correlations with eastern Klamath Terrane geology

The Quinn River Formation, Black Rock terrane, Quinn River Crossing, is one of the few Nevadan sections of Permian and Triassic strata that are unaffected by Sonoman deformation. The formation consists of: (1) a basal tuff overlain by limestone and ferruginous dolomite, (2) interbedded radiolarian-bearing chert and argillite, (3) siltstone and carbonaceous shale, and (4) partly volcaniclastic rocks that include siltstone, shale, and minor sandstone and radiolarian-bearing argillite. Disconformities separate the dolomite from the radiolarian chert and the chert from the siltstone and shale. Abrupt lithologic and faunal changes indicate that the partly volcaniclastic unit is faulted. All but the uppermost (barren) chert samples contain Late Permian (Abadehian and Djulfian) radiolarian taxa belonging to Albaillella, Deflandrella, Ishigaum, Neoalbaillella, and Triplanospongos. These radiolarians suggest that early Wordian conodonts reported from near the top of the chert and argillite unit are reworked. Poorly preserved Early(?) or Middle Triassic radiolarians and Middle Triassic ammonites and pectenacid bivalves from the middle part of the volcaniclastic unit indicate that Early Triassic deposition cannot be documented at the Quinn River locality. Late Triassic (early to middle Carnian) radiolarians assignable to the Triassocampe nova Assemblage Zone of Yao occur about 21 meters below the top of the Quinn River section; diagnostic genera include Castrum, Corum, Poulpus, Pseudostylosphaera, Triassocampe, and Xipha. The ages of the Quinn River brachiopod, conodont, and radiolarian faunas resemble those of the Dekkas and Pit Formations, eastern Klamath terrane, northern California. The Early Triassic age for the lower part of the Pit Formation is questioned because the unit contains only unidentifiable "primitive" radiolarians and long-ranging (Late Permian and Early Triassic) neogondolellid conodonts. The analogous Quinn River and eastern Klamath rock types and faunal ages, as well as similar hiatuses in their stratigraphic records, suggest that they may be lateral equivalents that formed in the same island-arc sedimentary basin.

[1]  C. Blome,et al.  Acid processing of pre-Tertiary radiolarian cherts and its impact on faunal content and biozonal correlation , 1993 .

[2]  K. Sugiyama.  Lower and middle Triassic radiolarians from MT. Kinkazan, Gifu prefecture, central Japan , 1992 .

[3]  C. Blome,et al.  Permian and Early(?) Triassic radiolarian faunas from the Grindstone terrane, central Oregon , 1992, Journal of Paleontology.

[4]  Kiyoko Kuwahara,et al.  Late Permian Albaillella (Radiolaria) from a Bedded Chert Section inthe Gujo-hachiman Area of the Mino BeltCentral Japan , 1992 .

[5]  K. Sashida.  912. EARLY TRIASSIC RADIOLARIANS FROM THE OGAMATA FORMATION, KANTO MOUNTAINS, CENTRAL JAPAN. PART 2 , 1991 .

[6]  N. J. Silberling,et al.  Lithotectonic terrane map of the western conterminous United States , 1987 .

[7]  P. D. Wever,et al.  Some Late Permian radiolarians from pelitic rocks of the Tatsuno Formation (Hyogo Prefecture), southwest Japan , 1986 .

[8]  H. Ishiga.  Late Carboniferous and Permian Radiolarian Biostratigraphy of Southwest Japan , 1986 .

[9]  C. Blome.  Upper Triassic Radiolaria and radiolarian zonation from western North America , 1984 .

[10]  A. Yao.  Middle Triassic to Early Jurassic Radiolarians from the Inuyama Area, Central Japan , 1982 .

[11]  石賀 裕明,et al.  Late Permian radiolarian assemblages in the Tamba district and an adjacent area, Southwest Japan , 1982 .

[12]  H. Ishiga,et al.  Some Permian Radiolarians in the Tamba District, Southwest Japan , 1980 .

[13]  C. Blome,et al.  Upper Triassic and Jurassic Pantanelliinae from California, Oregon and British Columbia , 1980 .

[14]  Y. Isozaki,et al.  Triassic and Jurassic Radiolarians from the Inuyama Area, Central Japan , 1980 .

[15]  R. Speed.  Collided Paleozoic Microplate in the Western United States , 1979, The Journal of Geology.

[16]  P. Abbott,et al.  Upper Triassic Radiolaria from the San Hipolito Formation, Baja California , 1979 .

[17]  P. D. Wever,et al.  Triassic Radiolarians from Greece, Sicily and Turkey , 1979 .

[18]  J. W. Skinner,et al.  Permian biostratigraphy and fusulinid faunas of the Shasta Lake area, northern California , 1965 .

[19]  H. P. Foreman.  Upper Devonian Radiolaria from the Huron member of the Ohio shale , 1963 .

[20]  A. Coogan.  Stratigraphy and paleontology of the Permian Nosoni and Dekkas formations (Bollibokka Group) , 1960 .