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Castorids (Castoridae, Mammalia) from the Early Miocene (MN 3) locality Ahníkov
Šmejkal, Roman ; Čermák, Stanislav (advisor) ; Mazuch, Martin (referee)
Beavers are members of Castoridae - the family of large rodents characterized by a robust skull of sciuromorphic type, a sciurognathous mandible, dentition with a tendency to hypsodoncy and incisives by uniserial microstructure. The aim of the thesis is a detailed morphometric analysis of the fossil material of beavers coming from the early Miocene (MN 3a) locality Ahníkov I, II in the Czech Republic. In the numerous material comprising 388 fragmentary specimens, all belonging to the genus Steneofiber, two distinct species were distinguished, attributed here as - Steneofiber eseri (the larger form) and Steneofiber aff. dehmi (the smaller form). Their taxonomy, systematics and assumed position within existing phylogenetic models were discussed. Key words: Castoridae, Steneofiber, Czech republic, Ahníkov, MN 3, early Miocene
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Palaeocology of plant-arthropod associations from the Lower Miocene of the Most Basin in northern Bohemia (Czech Republic)
Knor, Stanislav
Terrestrial plants and insects account for the majority of the Earth's biodiversity today, and almost half of all insect species are herbivores. Thus, insects and plants share ancient associations date back for more than 400 million years. However, investigation of their interactions stands largely at the beginning in Western Europe. Nearly 4300 plant remains showing various kinds of feeding damages are available for the present study. These trace fossils are classified as so-called functional feeding-groups supply an outstanding example of the complexity, the structure and the changes of terrestrial ecosystems, are not well known during this interval. In Europe, the Neogene is characterized by palaeogeographic re- organization due to the collision of the African with the Eurasian plates. The Neogene plant record in Europe is rich and diverse offering a profound large-scale understanding of the floristic and vegetational development. A database of fossil traces from the Most Basin was compiled and analyzed by various statistical methods in terms of the diversity and intensity of palaeo-herbivory. The primary objective is to present results on the development of insect herbivory through the section of the Bílina Mine in North Bohemia, with the aim of understanding principal factors that caused the...
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Castorids (Castoridae, Mammalia) from the Early Miocene (MN 3) locality Ahníkov
Šmejkal, Roman ; Čermák, Stanislav (advisor) ; Mazuch, Martin (referee)
Beavers are members of Castoridae - the family of large rodents characterized by a robust skull of sciuromorphic type, a sciurognathous mandible, dentition with a tendency to hypsodoncy and incisives by uniserial microstructure. The aim of the thesis is a detailed morphometric analysis of the fossil material of beavers coming from the early Miocene (MN 3a) locality Ahníkov I, II in the Czech Republic. In the numerous material comprising 388 fragmentary specimens, all belonging to the genus Steneofiber, two distinct species were distinguished, attributed here as - Steneofiber eseri (the larger form) and Steneofiber aff. dehmi (the smaller form). Their taxonomy, systematics and assumed position within existing phylogenetic models were discussed. Key words: Castoridae, Steneofiber, Czech republic, Ahníkov, MN 3, early Miocene
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Palaeocology of plant-arthropod associations from the Lower Miocene of the Most Basin in northern Bohemia (Czech Republic)
Knor, Stanislav
Terrestrial plants and insects account for the majority of the Earth's biodiversity today, and almost half of all insect species are herbivores. Thus, insects and plants share ancient associations date back for more than 400 million years. However, investigation of their interactions stands largely at the beginning in Western Europe. Nearly 4300 plant remains showing various kinds of feeding damages are available for the present study. These trace fossils are classified as so-called functional feeding-groups supply an outstanding example of the complexity, the structure and the changes of terrestrial ecosystems, are not well known during this interval. In Europe, the Neogene is characterized by palaeogeographic re- organization due to the collision of the African with the Eurasian plates. The Neogene plant record in Europe is rich and diverse offering a profound large-scale understanding of the floristic and vegetational development. A database of fossil traces from the Most Basin was compiled and analyzed by various statistical methods in terms of the diversity and intensity of palaeo-herbivory. The primary objective is to present results on the development of insect herbivory through the section of the Bílina Mine in North Bohemia, with the aim of understanding principal factors that caused the...
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Paleoenvironmental interpretation of elemental geochemical proxies of the borehole Jp 585: Lower Miocene lacustrine offshore clays of Cypris Formation, Sokolov Basin
Erlebachová, Alice ; Martínek, Karel (advisor) ; Opluštil, Stanislav (referee)
This thesis presents geochemical study of the Lower Miocene lacustrine offshore clays of the Cypris Formation in the Sokolov Basin of the Eger Graben aimed at paleoenvironmental reconstruction. The applicability of elemental geochemistry proxies in the interpretation of 94 m thick lithologically monotonous, offshore lacustrine clay succession of the well core Jp 585 is tested. Geochemical proxy data seems to be a good indicator of changes in source areas ,erosion rates and climate. XRF analysis shows for example decrease of detrital input and the increase in amount of authigenic silica and carbonates upwards in the section. The results of CEC analysis point to a rapid variations of expandable clay minerals content. Marked increase of CEC is at 40 m depth. Combination of XRF and CEC enabled suggesting of four chemostratigraphical units. Their boundaries are often sharp, pointing to rapid changes in lake metabolism. These changes are preliminary interpreted as climate changes.
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Study of xylitic wood of the Most Basin using the electron microscopy: systematics and palaeoenvironment
Boudová, Jana ; Sakala, Jakub (advisor) ; Ovčaří, Pavla (referee)
In the Most Basin, there is a rich variety of plant macrofossils, whose findings are described for the first time already in the 19th century. The presented thesis is focused on conifer wood preserved as xylitic stumps in situ. The samples come from the so-called "stumpy horizont No. 31" situated in the roof of the main lignite seam in the Bílina Mine. A detailed xylotomical study with scanning electron microscopy allows their assignment to the Cupressaceae s.l., to the morphospecies Glyptostroboxylon rudolphii and Taxodioxylon gypsaceum.
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Palaeocology of plant-arthropod associations from the Lower Miocene of the Most Basin in northern Bohemia (Czech Republic)
Knor, Stanislav ; Prokop, Jakub (advisor) ; Teodoridis, Vasilis (referee)
Terrestrial plants and insects account for the majority of the Earth's biodiversity today, and almost half of all insect species are herbivores. Thus, insects and plants share ancient associations date back for more than 400 million years. However, investigation of their interactions stands largely at the beginning in Western Europe. Nearly 4300 plant remains showing various kinds of feeding damages are available for the present study. These trace fossils are classified as so-called functional feeding-groups supply an outstanding example of the complexity, the structure and the changes of terrestrial ecosystems, are not well known during this interval. In Europe, the Neogene is characterized by palaeogeographic re- organization due to the collision of the African with the Eurasian plates. The Neogene plant record in Europe is rich and diverse offering a profound large-scale understanding of the floristic and vegetational development. A database of fossil traces from the Most Basin was compiled and analyzed by various statistical methods in terms of the diversity and intensity of palaeo-herbivory. The primary objective is to present results on the development of insect herbivory through the section of the Bílina Mine in North Bohemia, with the aim of understanding principal factors that caused the...
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