International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

Upper Cretaceous to Lower Miocene of the Subsilesian Unit (Western Carpathians, Czech Republic): stratotypes of formations revised

Pages: 239 - 256

Authors: MIROSLAV BUBÍK, JURAJ FRANCŮ, HELENA GILÍKOVÁ, JIŘÍ OTAVA, LILIAN ŠVÁBENICKÁ

Abstract: Type sections/areas for all four formations distinguished in the sedimentary succession of the Subsilesian Unit on Czech territory were revisited and described. New data on lithology, sedimentology, fossil record, biostratigraphy, heavy-minerals and geochemical proxies are based on observations and analysis of these sections. The historical type section of the Frýdek Formation was destroyed during railway construction in 19th century. Outcrops of Campanian to Maastrichtian marls and sandstones on the southwestern slope of “Castle hill” at Frýdek, are proposed as a new type section. The Ostravice riverbed in Frýdlant nad Ostravicí was originally designated as the type area, not mentioning the particular section. This area, even when supplemented with Sibudov Creek, does not show all typical facies of the formation. The outcrops range from lowermost Eocene to Eocene–Oligocene transition. In the original description of the Menilite Formation Glocker mentioned several localities in the area covering the Ždánice, Subsilesian and Silesian units, not mentioning the principal one. The single sections, each not exceeding a thickness of 2 m, are not sufficient to be a type section. Instead of that, we propose the area between Paršovice and Bystřice pod Hostýnem, covering the historical localities, as the type area. The type locality of the Ženklava Formation is an outcrop in an unnamed creek in Ženklava according to the original definition. It seems to be reasonable to extend the type section to the whole 500 m long section of the creek with the outcrops that better illustrate the lithological variability of the formation. New biostratigraphic data allow assignment to late Egerian (Eggenburgian?)

Keywords: Subsilesian Unit, Outer Flysch Carpathians, Cretaceous, Palaeogene, Miocene, lithostratigraphy, biostratigraphy, heavy minerals, geochemistry

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