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Graptolites from the Qilang and Yingan formations (Caradoc, Ordovician) of Kalpin, western Tarim, Xinjiang, China

Published online by Cambridge University Press:  20 May 2016

Chen Xu
Affiliation:
Nanjing Institute of Geology and Palaeontology, Academia Sinica, China, <xuchen@jlonline.com>
Ni Yu-Nan
Affiliation:
Nanjing Institute of Geology and Palaeontology, Academia Sinica, China, <xuchen@jlonline.com>
Charles E. Mitchell
Affiliation:
Department of Geology, State University of New York at Buffalo, Buffalo, 14260-3050, <cem@geology.buffalo.edu>
Qiao Xin-Dong
Affiliation:
Regional Geological Surveying Team of Xinjiang, China
Zhan Shi-Gao
Affiliation:
Xinjiang Petroleum College, China
Corresponding

Abstract

Late Ordovician rocks of the Qilang and Yingan formations from the Kalpin area in the Tarim region of western Xinjiang, China (Tarim palaeoplate) contain a moderately diverse graptolite fauna. The fauna from the Qilang Formation contains Corynoides calicularis Nicholson, 1867; Dicranograptus clingani resicis Williams and Bruton, 1983; Lasiograptus costatus Lapworth, 1873; Pseudoclimacograptus scharenbergi (Lapworth, 1876); and Glossograptus sp. among other species. This assemblage most likely corresponds to the upper Climacograptus (Climacograptus) bicornis Zone? to lower C. (Diplacanthograptus) lanceolatus Zone of Australia. The Qilang Formation also yields the new taxon, Amplexograptus maxwelli spinousus new subspecies. The overlying Yingan Formation yields a more diverse assemblage that includes Climacograptus (Diplacanthograptus) spiniferus Ruedemann, 1912; C. (D.) lanceolatus VandenBerg, 1990; Orthograptus quadrimucronatus (Hall, 1865); Amplexograptus praetypicalis Riva, 1987; Dicellograptus pumilus Lapworth, 1876; and D. morrisi Hopkinson, 1871. This assemblage most likely corresponds to the Corynoides americanus Zone through the C. (D.) spiniferus Zone of eastern Laurentia, or to the D. clingani Zone of Scotland and central Newfoundland. The presence of a C. (D.) lanceolatus and C. (D.) spiniferus succession in the Yingan Formation also suggests correlation with the Eastonian 1 and 2 of Australasia. The Yingan Formation faunas represent an offshore Pacific Province assemblage dominated by cosmopolitan epipelagic species. The fauna is most similar, both in terms of species composition and relative abundance patterns, to those of the Appalachian Basin. The Yingan faunas differ from the latter in the absence of Laurentian endemic species (except for Amplexograptus praetypicalis), and in the common occurrence of dicellograptids.

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Graptolites from the Qilang and Yingan formations (Caradoc, Ordovician) of Kalpin, western Tarim, Xinjiang, China
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