Ordovician (middle Darriwilian-earliest Sandbian) conodonts from the Wuhai area of Inner Mongolia, North China

Abstract

Forty-two conodont species belonging to 26 genera, which span the middle Darriwilian to the earliest Sandbian interval, are documented from the Wolonggang and Hatuke Creek sections in the Wuhai area of Inner Mongolia, North China. This conodont fauna is dominated by cosmopolitan and widespread species and accompanied by several endemic taxa. Four conodont zones, the Dzikodus tablepointensis, Eoplacognathus suecicus, Pygodus serra, and P. anserinus Zones, and three subzones, the Pygodus lunnensis, P. anitae, and Yangtzeplacognathus foliaceus Subzones, are recognized. Because of its slope habitat, the conodont fauna of Wuhai area differs from the coeval faunas on the North China Platform, which reflect a shallower and warmer water environment, but is similar to the contemporaneous faunas in Baltoscandia, South China, and Tarim. Moreover, the studied sections share several stratigraphically diagnostic taxa with the counterparts of the North China Platform and Western Newfoundland, which makes it an effective link for biostratigraphic correlations both regionally and internationally. The stratigraphically regular occurrences of Spinodus spinatus, a good index of a deep-water environment, represent a Spinodus biofacies that agrees with the Ordovician paleo-tectonic regimes of North China.

High-resolution conodont biostratigraphy from the Darriwilian Stage (Middle Ordovician) of the Argentine Precordillera and biodiversity analyses: a CONOP9 approach

“…Following the Scotese reconstructions (Scotese ), the Precordillera is considered to be located at middle palaeolatitudes (between 30° and 60°S); however, it bears a tropical conodont fauna similar to that of Laurentia (see Stouge ) and North China (see Jing et al . , ), which may indicate that the conodont species migrations from this basin were controlled mainly by palaeocurrents that linked the Precordillera with lower latitude palaeoplates. The diversification peak of the Precordillera is concomitant with a highstand sea level time span after the early Middle Ordovician transgression event that affected the basin.…”

“…L€ ofgren 2004), China (e.g. Du et al 2005;Jing et al 2015Jing et al , 2016 and New Zealand (e.g. Zhen et al 2011a), and the genera Periodon and Histiodella with Western Newfoundland (Stouge 1984(Stouge , 2012, South China (Wu et al 2012), North China and Tarim (Wu et al 2014b).…”

Biostratigraphy and palaeoecology of Middle and Late Ordovician conodonts from the Hulo and Yenwashan formations, western Zhejiang, south‐eastern China

“…In North China, Jing, Zhou, and Wang () documented D. tablepointensis Biozone, E. suecicus Biozone, and Pygodus serra Biozone from the lower Klimoli Formation in the Wuhai area of Inner Mongolia. In their later study, however, the H .…”

“…Furthermore, the P. anserinus Biozone has been documented from the North China Craton (Jing et al, ; Z. H. Wang et al, ), the Precordillera of Argentina (Albanesi et al, ; Albanesi & Ortega, ； Feltes et al, ; Feltes, Serra, Ortega, & Albanesi, ; Heredia & Rosales, ; Lehnert, Bergström, Keller, & Bordonaro, ; Serra et al, ; Figure ), Newfoundland (Bergström, Riva, & Kay, ), North America (Bergström, ; Harris, Bergström, Ethington, & Ross, ), Kazakhstan (Tolmacheva, Degtyarev, Ryazantsev, & Nikitina, ), and Southern Asia (Agematsu, Sashida, Salyapongse, & Sardsud, ).…”

Graptolite and conodont faunas of Upper Ordovician (Sandbian) successions of the Argentine Precordillera: Biostratigraphic implications

“…In North America, it has been identified in the eastern part of the Appalachians and from Alabama to Virginia (Bergström, ), in the Marathon basin, Texas (Bergström, ), in the Great Basin and Rocky Mountains (Harris, Bergström, Ethington, & Ross, ), and in Newfoundland (Bergström, Riva, & Kay, ). It is also present in Poland (Dzik, ), in Baltoscandia (Bergström, , ; Löfgren, ; Pålsson, Månsson, & Bergström, ), in the Polyakovka Formation in the South Urals (Dubinina & Ryazantsev, ), south and northwestern China (An, ; Jing, Zhou, & Wang, ; Zhen et al, ), Thailand (Agematsu, Sashida, Salyapongse, & Sardsud, ), Kazakhstan (Tolmacheva, Degtyarev, Ryazantsev, & Nikitina, ), and New South Wales in Australia (Zhen, Percival, & Webby, ).…”