Obrancu miru 75

Czech Republic

Obrancu miru 75

Czech Republic

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Fatka O.,Charles University | Szabad M.,Obrancu miru 75
Bulletin of Geosciences | Year: 2014

Previously published biostratigraphical subdivisions of the "middle" Cambrian succession of the Příbram-Jince Basin in the Barrandian area are summarized and a modified subdivision of twelve biozones proposed. Nine of the biozones are delimited by the first appearance of the eponymous species; five of these are interval zones and four are taxon-range zones. The youngest stratigraphical levels of the fossiliferous sequence in the Litavka River Valley, which lack any characteristic taxa, are assigned to one assemblage zone that is subdivided into two levels defined by the presence of two trilobites and two lingulate brachiopods. The Kodymirus vagans, Hypagnostus parvifrons and Dawsonia bohemica zones, and the Barren interzone between Paradoxides (Eccaparadoxides) pusillus-Paradoxides (Paradoxides) paradoxissimus gracilis, are newly established; the other zones are redefined or the earlier definitions retained.


Fatka O.,Charles University | Szabad M.,Obrancu Miru 75
Palaontologische Zeitschrift | Year: 2014

A slightly crushed but otherwise nearly complete specimen of the recently described rhombiferan echinoderm genus Vizcainoia Zamora and Smith, 2012 is documented from the "Middle" Cambrian Jince Formation of the Příbram-Jince Basin of the Czech Republic. Isolated thecal plates, earlier determined as calyx plates of the eocrinoid Acanthocystites briareus Barrande, 1887 and/or as eocrinoid sp., occurring in diverse levels of the Jince Formation are reassigned to Dibrachicystidae gen. et sp. indet. Similarly, isolated thecal plates collected from the Buchava Formation of the Skryje-Týřovice Basin could be classified as Dibrachicystidae gen. et sp. indet. Specimens from the Barrandian area are the first records of the family Dibrachicystidae outside of southwestern Europe, of the family otherwise known only from the Languedocian of Montagne Noire of France and from the Caesaraugustian and Languedocian of Iberian Chains of northern Spain. © 2013 Springer-Verlag Berlin Heidelberg.


Valent M.,National Museum | Fatka O.,Charles University | Szabad M.,Obrancu miru 75 | Vokae V.,Zabelska 53
Palaeobiodiversity and Palaeoenvironments | Year: 2011

The hyoliths Slehoferites slehoferi gen. et sp. nov. and Carinolithes bohemicus sp. nov. are described from carbonatic nodules and shale at different stratigraphic levels within the middle Cambrian Buchava Formation of the Skryje-Ty̌řovice Basin in the Czech Republic. Carinolithes bohemicus sp. nov. may be distinguished by a slightly dorsally curved conch with three longitudinal rounded ridges forming a distinct keel on the dorsum and by a platyclaviculate operculum with broad clavicles with their distal ends open, whereas the defining traits of Slehoferites slehoferi gen. et sp. nov. are a conch with a slightly rounded triangular cross-section, distinct muscle scar on the ligula and a platyclaviculate operculum with an almost circular outline and with broadly diverging cardinal processes clavicles (about 40 degrees for clavicles) with a cone cavity below each clavicle. Both taxa are combined under the new family Carinolithidae which differs from other hyolithid families in having a dorsum with developed keel-like ridges, faily long ligula, and a platyclaviculate operculum with distinct and broadly diverging cardinal processes. © Senckenberg Gesellschaft für Naturforschung and Springer 2011.


Valent M.,National Museum | Fatka O.,Charles University | Szabad M.,Obrancu miru 75 | Micka V.,Satrova 662 | Marek L.,Academy of Sciences of the Czech Republic
Bulletin of Geosciences | Year: 2012

Two orthothecid hyoliths Probactrotheca briketa new genus and new species and Circotheca smetanai new species are described from the Middle Cambrian Buchava Formation of the Skryje-Týřovice Basin in the Czech Republic. The new forms are based on about twenty well-preserved external and internal moulds of opercula and conchs. The stratigraphic range and geographic distributions for both taxa are well known.


Fatka O.,Charles University | Kraft P.,Charles University | Szabad M.,Obrancu miru 75
Comptes Rendus - Palevol | Year: 2012

Ten specimens of two phosphatic fossils have been recently discovered in lower and middle portions of Middle Cambrian Jince Formation in the Czech Republic. They are attributed to the genus Sphenothallus Hall, 1847 and described as two separate species; comparatively small conchs are described as S. kozaki sp. nov., the much larger specimens characterized by its smooth and partly flexible organo-phosphatic walls of shell are determined as ?S. kordulei sp. nov. Sphenothallus is known to range from Cambrian to Permian and accommodates numerous species. However, its Cambrian distribution is considerably restricted. Generally rare specimens have been described from Lower to Middle Cambrian of Laurentia and from the Lower Cambrian of Gondwana and peri-Gondwana. The new record of Sphenothallus from the Jince Biota represents a notable extension of their geographic range. © 2012 Académie des sciences.


Fatka O.,Charles University | Szabad M.,Obrancu miru 75
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2011

Occurrence of three entirely preserved articulated exoskeletons of holaspid specimens of the agnostid Peronopsis integra (BEYRICH, 1845) entombed under and/or within different parts of carapaces of the large polymerid trilobite species Paradoxides {Hydrocephalus) minor (BOECK, 1827) are described from the Jince Formation (Drumian) of the Přibram-Jince Basin. Conchicolous habit and/or feeding of the tiny Peronopsis on deteriorating soft parts of large carcasses of Paradoxides are proposed as two plausible explanations for entombment of the agnostid specimen. Both of these hypotheses support a benthic mode of life for the agnostid Peronopsis, and perhaps for all agnostids. © 2011 E. Schwelzerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.


Fatka O.,Charles University | Kraft P.,Charles University | Szabad M.,Obrancu miru 75
Acta Palaeontologica Polonica | Year: 2011

Isolated sclerites of the genus Wiwaxia are reported from shale interlayers in lower levels of middle Cambrian (unnamed 3 rd Series of Cambrian) Buchava Formation in the Skryje-Týřovice Basin in the Czech Republic interpreted as shallow-water sediments. Geographic distribution of Wiwaxia indicates latitudinal control as all occurrences are obviously restricted to tropical belt.


Fatka O.,Charles University | Szabad M.,Obrancu miru 75
Palaontologische Zeitschrift | Year: 2011

A trace fossil associated with its assumed in situ maker, a holaspid specimen of the trilobite Agraulos ceticephalus (Barrande in Notice préliminaire sur le Systême Silurien et les trilobites de Bohême, Leipzig, 1846), is reported from the middle Cambrian Buchava Formation (Drumian Stage) of the Skryje-Týřovice Basin, Czech Republic. The ichnofossil is preserved on the surface of a mudstone, behind the posterior part of the intact trilobite exoskeleton; this natural association is interpreted as mortichnia. Possible mode of life and feeding strategy of the trilobite genus Agraulos are discussed. For the association of a fodichnion with its producer preserved in situ (atop, in, or at the end of its trace fossil), the designation fodichnial association is proposed. © 2011 Springer-Verlag.


Fatka O.,Charles University | Mikulas R.,Academy of Sciences of the Czech Republic | Szabad M.,Obrancu miru 75 | Micka V.,Satrova 662 | Valent M.,National Museum
Acta Geologica Polonica | Year: 2011

The presence of the ichnospecies Arachnostega gastrochaenae Bertling, 1992 is documented from the Cambrian for the first time. it occurs in several stratigraphical levels of the "middle" Cambrian sediments in the Příbram- Jince and Skryje-Týřovice basins of the Teplá-Barrandian region in the Czech Republic. Simple tunnels as well as the complicated morphologies of Arachnostega were observed on internal moulds of trilobite exoskeletons and hyolith conchs and represent the oldest record of this ichnogenus. The Cambrian occurrences of Arachnostega on skeletal body fossils evoke the connection between the Arachnostega-type feeding strategy and the sudden appearance of numerous skeletal animals. The development of the Arachnostega-type behaviour can be considered a feature of the "Cambrian substrate revolution.".


Fatka O.,Charles University | Micka V.,Satrova 662 | Szabad M.,Obrancu miru 75 | Vokac V.,Zabelska 53 | Vorel T.,Czech Geological Survey
Bulletin of Geosciences | Year: 2011

All earlier published concepts and stratigraphical subdivisions of the Cambrian succession in the Skryje-Týřovice Basin are summarized. Forty-two different proposals for lithostratigraphic subdivision published since 1846 are discussed and plotted in seven figures. Here, modified subdivision for the Skryje-Týřovice Basin includes four lithostratigraphic units, the Mileč Member, the Slapnice Member and the Skryje Member, all representing different lithofacies within the newly established Buchava Formation. The whole sedimentary succession contains a rich record of skeletal fauna and is correlated with the Third unnamed Series of the Cambrian System, corresponding to the traditional middle Cambrian Series.

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