Subdivision of the Lochkovian Stage based on conodont faunas from the stratotype area (Prague Synform, Czech Republic)

Abstract

Relatively rich conodont faunas from sections in the Prague Synform (Barrandian area, Czech Republic) include a number of indexes and other important guide conodonts that can be correlated with other regions, especially with Nevada and the Spanish Central Pyrenees. The collation and detailed correlation of conodont data from the Lochkovian in two parallel sections in the Požáry quarries, together with biostratigraphic control of additional data from several (incomplete) sections with changing facies development, is the basis for a new detailed regional biozonal scale for the Lochkovian in the Prague Synform. The new subdivision follows, with modification, the global threefold conodont subdivision of the Lochkovian. Data from the Prague Synform enable further detailed subdivision of the lower, middle and upper Lochkovian into small‐scale units. The conodont distribution shows a large proportional discrepancy between the late Lochkovian elsewhere; the conodont record in the latest Lochkovian in the Prague Synform area, which appears to be rather restricted and requires further discussion. Copyright © 2012 John Wiley & Sons, Ltd.

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

“…Carls et al 2007). The age of the upper part of the Outcrop 1 can be correlated, e.g., with the hesperius-optima Zone of the Prague Synform (Slavík et al 2012) and C. hesperius Zone of Podolia (Drygant & Szaniawski 2012).…”

“…The zone is also present in Sardinia and Carnic Alps (Corradini & Corriga 2012). The oldest Lochkovian zonal equivalent in the Prague Synform (Barrandian area) is the "hesperius-optima Zone" (Slavík et al 2012). The associated Z. r. remscheidensis is typically an early Lochkovian taxon (cf.…”

“…The missing interval between Outcrops 1 and 2 is probably stratigraphically very short and is tentatively assigned to the optima-omoalpha Zone. Both nominal taxa are present above (in the Sherlubai Horizon): the succession of entries of the nominal taxa of the zone has been described, e.g., in the Prague Synform (Slavík et al 2012).…”

“…The sea-level change is pronounced in areas around peri-Gondwana. In the Prague Synform, the earliest Pragian time was interpreted as a "hot lowstand" (Hladil et al 2008, Koptíková et al 2010, with a very low accumulation rate (Slavík et al 2012). The trend of a gradual increase in energy and shallowing at the base of the Pragian is known as the Basal Pragian Event (Chlupáč & Kukal 1986, 1988House 2002) (also = the Lochkovian/Pragian Boundary Event, Walliser 1996).…”

Unusual occurrence of dalmanitid trilobites in the Lochkovian of the Prague Basin (Czech Republic)

“…This facies development is characterised by predominantly carbonate sedimentation (see Paris & Robardet 1990, Robardet 2003, Slavík 2004, Slavík et al 2012. In the typical area of their occurrence, the Prague Basin (Fig.…”