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Potenciální výskyt analogie „red beds“ v bohdaleckém souvrství (svrchní ordovik Barrandienu, Česká Republika): paleontologická charakteristika

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    0551917 - GLÚ 2022 RIV CZ cze J - Journal Article
    Janebová, R. - Mikuláš, Radek
    Potenciální výskyt analogie „red beds“ v bohdaleckém souvrství (svrchní ordovik Barrandienu, Česká Republika): paleontologická charakteristika.
    [The possible occurrence of the “red beds” analogy in the Bohdalec Formation (Upper Ordovician of the Barrandian area, Czech Republic) and their palaeontological content.]
    Zprávy o geologických výzkumech = Geoscience Research Reports. Roč. 54, č. 1 (2021), s. 37-41. ISSN 0514-8057
    Institutional support: RVO:67985831
    Keywords : Ordovician * marine red beds * fossils * Barrandian area
    OECD category: Paleontology
    Method of publishing: Open access
    http://www.geology.cz/img/zpravyvyzkum/fulltext/Janebova_web.pdf

    V bohdaleckém souvrství (ordovik Pražské pánve) byly nalezeny a paleontologicky prozkoumány jílové břidlice nápadně červené barvy. Jejich fauna je chudá, s jedinci nápadně malých rozměrů. To ukazuje, že příčinou červené barvy břidlic je spíše primární oligotrofie (nedostatek živin) v substrátu, než hluboké před-křídové zvětrávání ordovických usazenin.

    The Bohdalec Formation (Katian Stage) belongs among the most varied units of the Ordovician of the Barrandian area. Apart from the so-called Polyteichus Facies, which itself contains a dozen of lithofacies, reddish clay shales were found in the dump of the underground railway tunnel between Petřiny and Motol stations. It seems improbable that the red colour of these rocks was caused by deep (? pre-Cretaceous) weathering, as the red shales show similar palaeontological characteristics, which is different from the content of grey shales established at the same dump. The fauna is relatively frequent but monotonous, bivalves of the genera Sluha and Myoplusia predominate. Besides, brachiopods Rostricellula ambigena, treptostomate bryozoans, undetermined ostracods and a gastropod Sinuitopsis neglecta are less common, trilobites of the genera Dalmanitina, Calymenella and Sokhretia occur rarely. Small platy remains attributable to ? Anomalocystis sp. were also discovered. The faunal assemblage (in combination with the reddish colour of the rock) points to the oxygenated water and possibly oligotrophic conditions.
    Permanent Link: http://hdl.handle.net/11104/0327124

     
     
Number of the records: 1  

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