Late Devonian ostracods (Crustacea) from the Hushoot Shiveetiin gol section (Baruunhuurai Terrane, Mongolia) and their p
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ORIGINAL PAPER
Late Devonian ostracods (Crustacea) from the Hushoot Shiveetiin gol section (Baruunhuurai Terrane, Mongolia) and their palaeoenvironmental implication and palaeobiogeographic relationship A. Nazik 1
&
P. Königshof 2
&
M. Ariuntogos 2,3 & J. A. Waters 4 & S. K. Carmichael 4
Received: 25 April 2020 / Revised: 6 July 2020 / Accepted: 21 July 2020 # Senckenberg Gesellschaft für Naturforschung and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract An Upper Devonian to (?)Lower Mississippian section at Hushoot Shiveetiin gol in the Baruunhuurai Terrane of the Central Asian Orogenic Belt (CAOB) was investigated. A generally well-preserved and diverse ostracod fauna was collected from the Late Devonian (Famennian) Samnuuruul Formation in western Mongolia. It is the first rich assemblage described from this area. The ostracod fauna consists of 19 genera and 25 species. Two of the species are proposed new species, and 13 species are described in open nomenclature. The Mongolian ostracod fauna is similar to coeval faunas in western China and Laurussia, but also contains new, endemic species. Two new taxa are described: Beyrichiopsis hushootensis and Ampuloides beckeri. Ostracod findings are characterized by the Eifelian Mega-Assemblage (I-III) representing a nearshore, variable palaeoenvironment which is in accordance with facies analysis provided by other studies. Keywords Ostracods . Mega-Assemblage . Zoogeography . Famennian . Mongolia
Introduction Reports on Palaeozoic faunas from Mongolia are sparse. Previous papers have described conodonts, corals and This is a contribution to a special series on The Central Asian Orogenic Belt (CAOB) during Late Devonian: new insights from southern Mongolia. * A. Nazik [email protected] 1
Faculty of Engineering Department, Cukurova University, Mithat Özsan Bulvari, TR-01330 Adana, Turkey
2
Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, 60325 Frankfurt, Germany
3
Mongolian University of Science and Technology, Baga Toiruu, Sukhbaatar District, Ulaanbaatar, Mongolia
4
Department of Geological and Environmental Sciences, Appalachian State University, 572 Rivers St., Boone, NC 28608, USA
echinoderms (e.g. Bolshakova et al. 2003; Webster and Ariunchimeg 2004; Ariunchimeg et al. 2014; Suttner et al. 2019), but Palaeozoic ostracods from Mongolia are previously unreported. Ostracods can provide critical data on palaeoenvironmental and palaeogeographical reconstructions. Many ostracod species and genera from the Devonian exhibit characteristic assemblages ranging from shallow water to deep marine environments (e.g. Bandel and Becker 1975; Wang 1988; Becker and Bless 1990; Becker and Blumenstengel 1995; Becker 2000; Groos-Uffenorde et al. 2000; Casier 2004; Becker et al. 2004; Crasquin and Horne 2018). In the framework of the International Geoscience Programme (IGCP) 596 and its successor, the Western Mongolia Working Group, our research group conducted fieldwork in western Mongolia in 2012, 2014 and 2018 (Kido et a
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