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Latest Ludlow chitinozoans from the Prague Basin: significanec for correlations and succession during Kozlowskii/Lau extinction events
Vodička, Jakub ; Fatka, Oldřich (advisor) ; Štorch, Petr (referee)
Two sections, Všeradice and Kosov, represent continuous sedimentary succession situated in the Prague Basin. No detailed research on stratigraphical level equal the N. kozlowskii graptolite zone focusing on chitinozoans, has not yet been conducted in the Prague Basin and is also very scarce globally. Limestone beds, examined for chitinozoans, were not very productive. Chitinozoan reaction on extinction is visible, if we compile data from both sections. The pre-extinct chitinozoan fauna is characterized by the Conochitinidae family. Samples from the post-extinct interval contained no chitinozoas. The interval of fauna recovery is characterized mainly by the Eisenackitina genera. In this interval, global zone for the uppermost Ludfordian, represented by E. barrandei, can be confirmed. In agreement with all the published literature, we have not found E. philipi, index taxa of the former global zone in the Prague Basin. E. lagenomorpha appears stratigraphically only slightly below E. barrandei and therefore it cannot substitute E. philipi, as it is used in Baltika region. chitinozoa, Prague Basin, Kozlowskii, Lau, extinction, Ludfordian, stratigraphy
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Lower Cretaceous belemnites and their occurrence in Czech Republic
Vaňková, Lucie ; Košťák, Martin (advisor) ; Marek, Jaroslav (referee)
The thesis deals with an complex overview of the Lower Cretaceous belemnites, and their occurrence in the Czech Republic, especially in Štramberk locality. First part provides a brief introduction to the Lower Cretaceous and to belemnite morfology with emphasis on internal skeleton especially of rostrum. Next chapter includes short review of morfometric analysis, which is the most important feature for taxonomy. The following part presents systematics and taxonomy of the Lower Cretaceous belemnite, and their paleoecological use as an indicators for paleotemperatures. There are also mentioned geographical occurrences and migrations of certain belemnite taxa and their stratigraphical evidence in the Lower Cretaceous sediments. The last part deals with the locality Štramberk, which is unique in the Czech Republic because of its stratigraphical evidence of the Lower Cretaceous belemnite fauna. Key words: Belemnites, Lower Cretaceous, systematice, palaeobiogeography, palaeoecology, Štramberk
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Lower Cretaceous belemnites of the locality Štramberk: taxonomy, stratigraphy, palaeoecology, palaeobiogeography
Vaňková, Lucie ; Košťák, Martin (advisor) ; Vašíček, Zdeněk (referee)
The study (MS, diploma thesis) is based on more than 1200 belemnite rostra set from the Lower Cretaceous sediments of locality Štramberk (N Moravia). Investigated rostra come from the collection of Dr. V. Houša, who collected them during the seventies to eighties of the last century, during intensive excavation of the Lower Cretaceous tectonic block named Š-12 "pocket". Belemnite rostra were determined at species and generic levels including 7 species and 18 genera. The majority of belemnite assemblage comes from the Lower Valanginian strata, however, also the Tithonian, Berriasian and Hauterivian taxa are present, what clearly documents the redeposition. The presence of mesohibilitids, known from the Barremian and younger deposits, still remains enigmatic. For better understanding of the redeposition proces, the alveolar infill formed by several generations of sediments, are investigated. Study of these sediments outlines the sedimentary development of the Baška elevation inside the Outer Carpathian system. Preliminary stable isotope data δ18 O and δ13 C received from belemnite rostra show different belemnite life-style during the ontogeny - i.e. juvenile bottom life style and adults inhabiting shallow/warmer waters. Negative values of δ18 O should be correlated with the "Valanginian extinction...
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Graptolites of the Šárka Formation (Middle Ordovician, Prague Basin) and their stratigraphical significance
Strossová, Zuzana ; Kraft, Petr (advisor) ; Bruthansová, Jana (referee)
Graptolites are one of the significant groups of stratigraphic index fossils in the Early Palaeozoic. They are used to determine the boundaries between bio- and chronostratigraphical units and to correlate them both on a regional and the global scale. The Šárka Formation, the Middle Ordovician lithostratigraphical unit of the Prague Basin (Teplá-Barrandian Unit), has yielded well-preserved and intensively studied graptolite fauna. Since the first studies carried out more than 100 years ago, much new facts and data has been gathered. They influenced a development and principal changes of the graptolite taxonomy and stratigraphy. Many key specimens were collected during the explorations of iron ore deposits in the vicinities of Rokycany, Ejpovice and Krušná hora Hill. This thesis summarises recent knowledge on graptolites from the Šárka Formation and its utilization in the stratigraphy. Key words: graptolites, Ordovician, Šárka Formation, stratigraphy
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Lower Cretaceous belemnites (including J/K boundary interval) in the NW Tethys, biostratigraphy, palaeobiogeography and palaeoecology
Vaňková, Lucie ; Košťák, Martin (advisor) ; Michalík, Jozef (referee) ; Fozy, István (referee)
This thesis deals with the belemnite fauna from the Outer Western Carpathians Klippen, its systematic classification, stratigraphical and palaeogeographical evaluation. The palaeontological/palaeobiological approach, together with isotope analyses, including of carbon and oxygen stable isotopes and of strontium isotopes, enabled an integrated investigation of the palaeoecological conditions during the Jurassic/Cretaceous (J/K) boundary interval and the Early Cretaceous age. The Tethyan belemnites are not intensively studied in detail in the J/K interval, as they occur rather rarely in the sections, and/or sedimentary conditions were not suitable for their preservation. Therefore, belemnites are described only from a few sites in the Mediterranean Province. On the basis of recent research, the stratigraphic range of several species previously considered to be from the Tithonian age was extended to the earliest Cretaceous. By contrast, the Lower Cretaceous belemnites (since the late Berriasian) are more abundant. In the classical areas of the Tethyan Realm, it is possible to study the Lower Cretaceous belemnites in great detail and, according to their higher abundance, to determine an individual assemblage corresponding to stratigraphical intervals. Their occurrence is also an important basement for...
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Cephalopod jaws from the Bohemian Cretaceous Basin - taxonomy and stratigraphic implications
Kozlová, Zuzana ; Košťák, Martin (advisor) ; Vašíček, Zdeněk (referee)
This work is focused on systematic research of cephalopod jaws from the Late Cretaceous. Samples of 147 newly recorded nautiloid rhyncholites from the Bohemian Cretacoeus Basin and one new ammonite rhyncholite from Řepov village were systematically analyzed. The new collection of lower ammonite jaws (aptychi) consists of 32 specimens. Nautiloid rhyncholites from localities Turkaňk, Úpohlavy, and Dreisen were determined as Nautilorhynchus simplex. Conchorhynchs from locality Vinary u Vysokého Mýta belong to the species Conchorhynchus cretaceous, which is associated with the commonmost species Eutrephoceras sublaevigatum. Ammonite rhyncholite is left in the open nomenclature due to its uncertain systematic position and it is not assigned to any ammonite species. Records of aptychi from the locality of Úpohlavy and Pecínov represent mainly species of heteromorphic ammonites - baculitids (Baculites, Sciponoceras). The total diversity of species from both localities reaches 20 ammonite species. The two jaw morphotypes (2 species of aptychi) are reported from the Bohemian Cretaceous Basin for the first time herein. Of the high importance, it is a record of ammonite Prionocyclus germari from Úpohlavy with associated lower jaws in situ within the body chamber. Aptychus of this taxon has never been...
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Fossil associations of the Dobrotivá Formation
Luptáková, Monika ; Kraft, Petr (advisor) ; Mergl, Michal (referee)
The bachelor thesis is focused on the overview about a fundamental knowledge on the fossil associations of the Dobrotivá Formation. This unit represents a distinct level of the Prague Basin volcano-sedimentary infill formed during the boundary interval of the Middle and Upper Ordovician. Its main part is composed of the acquired and published data in the wider context of the neighboring paleocontinents and areas of peri-Gondwana. The thesis briefly describes the development of the Prague Basin and its paleogeography. It summarizes the lithology of the Dobrotivá Formation, its stratigraphic classification and the recently published knowledge on faunal associations in the Dobrotivá Formation, including their paleobiogeography and paleoecology. The bachelor thesis is considered to be a basis for further study of the Dobrotivá Formation. Key words: Ordovician, Prague Basin, assemblages, localities, stratigraphy, paleobiogeography
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Graptolites of the Šárka Formation (Middle Ordovician, Prague Basin) and their stratigraphical significance
Strossová, Zuzana ; Kraft, Petr (advisor) ; Bruthansová, Jana (referee)
Graptolites are one of the significant groups of stratigraphic index fossils in the Early Palaeozoic. They are used to determine the boundaries between bio- and chronostratigraphical units and to correlate them both on a regional and the global scale. The Šárka Formation, the Middle Ordovician lithostratigraphical unit of the Prague Basin (Teplá-Barrandian Unit), has yielded well-preserved and intensively studied graptolite fauna. Since the first studies carried out more than 100 years ago, much new facts and data has been gathered. They influenced a development and principal changes of the graptolite taxonomy and stratigraphy. Many key specimens were collected during the explorations of iron ore deposits in the vicinities of Rokycany, Ejpovice and Krušná hora Hill. This thesis summarises recent knowledge on graptolites from the Šárka Formation and its utilization in the stratigraphy. Key words: graptolites, Ordovician, Šárka Formation, stratigraphy
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