Correlation of Early Devonian (Lochkovian-early Pragian) conodont faunas of the South Urals (Russia)

 

Authors: Mavrinskaya T, Slavík L

Published in: Bulletin of Geosciences, volume 88, issue 2; pages: 283 - 296; Received 19 December 2012; Accepted in revised form 11 February 2013; Online 6 March 2013

Keywords: South Urals, West Zilair Zone, Lower Devonian, global conodont correlation, Lochkovian,

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Abstract

Carbonate successions of the early Lower Devonian (Lochkovian-early Pragian) from the Mindigulovo section (West Zilair Zone, western slope of the South Urals) can be globally correlated using diverse conodont faunas. The number of the documented widespread or cosmopolitan taxa of the Lochkovian and early Pragian age enables the definition of globally recognized conodont successions and the establishment of a refined regional conodont biozonal scale. The present three-fold global subdivision of the Lochkovian Stage can be applied as well to the studied area. The Lochkovian in the South Urals is represented by two Horizons (regional terminology) with different facies development: 1. The Siyak Horizon of the lower Lochkovian characterized by the dominance of shallow-water organogenic limestones of the hesperius-optima and optima-omoalpha Zones, and 2. The Sherlubai Horizon of the middle and upper Lochkovian age characterized by the dominance of carbonate-terrigenous successions. The middle and upper Lochkovian is subdivided into five biozones (using a binominal system): omoalpha-eoeleanorae, eoeleanorae-eleanorae, eleanorae-trigonicus, trigonicus-pandora beta and pandora beta-sulcatus eta/steinachensis. The Lochkovian-Pragian boundary and the early Pragian time are determined by the presence of eognathodontid and icriodontid stocks. The established regional conodont zonal scale in the South Urals provides a solid basis for refined correlation with the Lochkovian-early Pragian carbonate rocks of peri-Gondwana and Euramerica.

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