|
|
Miocene fish fauna from the Cheb and Sokolov Basins: taxonomic overview and palaeoecology
Hakalová, Pavla ; Přikryl, Tomáš (advisor) ; Mazuch, Martin (referee)
The aim of this thesis is to present an overview of Miocene fish fauna of the lacustrine sediments in the Cheb and Sokolov Basins, geological settings of this area, and fish associations in individual biozones. Sediments of Cheb and Sokolov Basins were deposited during time interval from Eocene until Miocene in the subtropical zone of the North hemisphere. Volcanic and post-volcanic activities of the Ohárecký rift influenced development of these basins. It's possible define two time sections within development of these basins: early and later; both of them provide rich record of fossil fishes. For the early period of the development is typical smaller range of the lake and its shallow depth. The relicts of this stage are limited to Cheb Basin mainly. Fish fossil record is limited, with three species only: Esox sp., Palaeotinca egeriana and Leuciscus (Palaeoleuciscus) socoloviensis. Low fish diversity could have been affected by poor living conditions or lower taxonomic diversity in general during this time. The later developmental period was much longer. The lake was much bigger - it spread to Sokolov Basin also. The fish fauna diversity is much higher, including taxons Paleotinca egariana, Leuciscus (Palaeoleuciscus) socoloviensis, Aphanius chebianus, Paralebias egeranus and Gobius sp. It is...
|
|
|
Miocene fish fauna from the Cheb and Sokolov Basins: taxonomic overview and palaeoecology
Hakalová, Pavla ; Přikryl, Tomáš (advisor) ; Mazuch, Martin (referee)
The aim of this thesis is to present an overview of Miocene fish fauna of the lacustrine sediments in the Cheb and Sokolov Basins, geological settings of this area, and fish associations in individual biozones. Sediments of Cheb and Sokolov Basins were deposited during time interval from Eocene until Miocene in the subtropical zone of the North hemisphere. Volcanic and post-volcanic activities of the Ohárecký rift influenced development of these basins. It's possible define two time sections within development of these basins: early and later; both of them provide rich record of fossil fishes. For the early period of the development is typical smaller range of the lake and its shallow depth. The relicts of this stage are limited to Cheb Basin mainly. Fish fossil record is limited, with three species only: Esox sp., Palaeotinca egeriana and Leuciscus (Palaeoleuciscus) socoloviensis. Low fish diversity could have been affected by poor living conditions or lower taxonomic diversity in general during this time. The later developmental period was much longer. The lake was much bigger - it spread to Sokolov Basin also. The fish fauna diversity is much higher, including taxons Paleotinca egariana, Leuciscus (Palaeoleuciscus) socoloviensis, Aphanius chebianus, Paralebias egeranus and Gobius sp. It is...
|
|
|
Petrography and sedimentary environment of the Josef Coal (Oligocene) in the Sokolov Basin
Jureková, Dominika ; Opluštil, Stanislav (advisor) ; Mach, Karel (referee)
The Josef Coal has the largest extent of all the Coals in the Sokolov Basin. The diploma thesis is concerned with studying of two profiles of the Josef Coal located in the opencast mines Medard-Libík and Družba for the purpose of micropetrograhic and chemical analyse. The goal of the diploma thesis is an interpretation of the sedimentary enviroment leading to formation of the Josef Coal based on the comparison of the petrographic and geochemical parametres of both profiles. Both studied profiles were initially macropetrographically described and sampled in a field. Samples were subsequently used for by maceral a chemical- technological analyses. The analysis of all 50 collected samples were performed at the Institute of Rock Structure and Mechanics Academy of Sciences of the Czech Republic. The micropetrographic composition was compared with chemical-technological standards. The macropetrographic description indicates some differences between both studied coal sections. The lower part of The Profile Josef 1 consists of the humic coal which in middle part evolves into the sapropelic one and that type persists the rest of the profile. The Profile Josef 2 is formed by sapropelic coal throughout the entire section except four decimeter thick benches of intercalated humic coal. Diferences in...
|
|
| |
guest ::
