|
|
Cenomanian vegetation of the Bohemian Cretaceous Basin
Čepičková, Jana ; Kvaček, Jiří (advisor) ; Teodoridis, Vasilis (referee) ; Spicer, Robert A. (referee)
Cenomanian plant fossils from the Peruc-Korycany Formation of the Bohemian Cretaceous Basin, Czech Republic are described, analysed and their palaeoenvironment is interpreted. Cycad foliage Nilssonia mirovanae Čepičková et J.Kvaček including micromorphology of its cuticle was described. It shows deeply sunken stomatal apparati surrounded by papillae overhanging the stomatal pit. The haplocheilic stomata are arranged in rows. Todziaphyllum saportanum (Velen.) Čepičková et J.Kvaček is a serrate-margined leaf with semicraspedodromous venation. Since the cuticle of this plant fossil has not been preserved, macro-observation is the only method available. Ascarinophyllum pecinovense Čepičková et J.Kvaček is a serrate-margined leaf, having an abaxial cuticle covered by striations, randomly oriented, and radially oriented striations around the stomata. This species shows a combination of laterocytic/laterocyclocytic, stephanocytic-bicyclic, amphibrachyparacytic, less frequently brachyparacytic and holoparacytic stomata, sometimes with T-shaped thickenings of the internal cuticle at the poles. Papillaephyllum labutae Čepičková et J.Kvaček is characterised by leaves with serrate margins. It shows an abaxial cuticle covered by large papillae. Its stomatal apparatus shows a combination of latero-cyclocytic and...
|
|
|
Paleoecological study of the Cretaceous extremophilic flora with emphasis on xerophytes
Čepičková, Jana ; Kvaček, Jiří (advisor) ; Teodoridis, Vasilis (referee)
Thestudied materialcomesfromtheBohemianCretaceousBasin,Peruc-Korycany FormationCenomanianage,fromthelocalitiesPecínovandPraha-MaláChuchle. Recent plantswereusedforcomparisonwithfossilxeropyhteandmesophyteplants.Fossilandrecent materialwasmacromorphologicallydocumentedandanalyzedusingcuticularanalysis. Inthesystematic part, elevenfossiltaxafromdivisions Lyginopteridophyta, Cycadophyta,Ginkgophyta,Pinophytaand Magnoliophytaweredescribed.Fromthese,three newtaxawereestablished:bennetiteleafofZamitesmirovanaesp.nov.,angiospermleavesof Dicotylophyllumlabutae sp. nov.andD. pecinovense sp. nov. Based onthestudy of macro-and micro-morphology,it wasdistinguished whichpartofthestudied material belongstotheextremophytes.Observationsofmicromorphologyshowedthatplantsthatwere exposedto waterstress weretryingto overcome thisconstraint byadjustingtheir micromorphology. Analysingpreviouslypublishedandnewlyacquireddatahelpedtoseparatehalophytes fromotherstudiedfossiltaxa.Theseplantsfromtheenvironmentofsaltymarshesandtide- influencedswampsarecharacterisedbythickcuticle,stomataembeddedinstomatalchamber and/orsurroundedbyraisedrimsorpapillae.Theyshowvariousformsofwrinklesorpapillae ontheir externalsurface ofepidermisandarecomparativelyabundantin sediments ofthePeruc-KorycanyFormation.Theboundarybetween...
|
|
|
Paleoecological study of the Cretaceous extremophilic flora with emphasis on xerophytes
Čepičková, Jana ; Kvaček, Jiří (advisor) ; Teodoridis, Vasilis (referee)
Thestudied materialcomesfromtheBohemianCretaceousBasin,Peruc-Korycany FormationCenomanianage,fromthelocalitiesPecínovandPraha-MaláChuchle. Recent plantswereusedforcomparisonwithfossilxeropyhteandmesophyteplants.Fossilandrecent materialwasmacromorphologicallydocumentedandanalyzedusingcuticularanalysis. Inthesystematic part, elevenfossiltaxafromdivisions Lyginopteridophyta, Cycadophyta,Ginkgophyta,Pinophytaand Magnoliophytaweredescribed.Fromthese,three newtaxawereestablished:bennetiteleafofZamitesmirovanaesp.nov.,angiospermleavesof Dicotylophyllumlabutae sp. nov.andD. pecinovense sp. nov. Based onthestudy of macro-and micro-morphology,it wasdistinguished whichpartofthestudied material belongstotheextremophytes.Observationsofmicromorphologyshowedthatplantsthatwere exposedto waterstress weretryingto overcome thisconstraint byadjustingtheir micromorphology. Analysingpreviouslypublishedandnewlyacquireddatahelpedtoseparatehalophytes fromotherstudiedfossiltaxa.Theseplantsfromtheenvironmentofsaltymarshesandtide- influencedswampsarecharacterisedbythickcuticle,stomataembeddedinstomatalchamber and/orsurroundedbyraisedrimsorpapillae.Theyshowvariousformsofwrinklesorpapillae ontheir externalsurface ofepidermisandarecomparativelyabundantin sediments ofthePeruc-KorycanyFormation.Theboundarybetween...
|
|
|
Palaeoclimatic study of the Cenomanian flora of Bohemian Massif
Čepičková, Jana ; Kvaček, Zlatko (advisor) ; Sakala, Jakub (referee)
The aim of this research is to analyse selected plant species from the specific Cenomanian deposits of the Bohemian Cretaceous Basin and their subsequent observation for determining climatic conditions in the Cenomanian age. Fossil plants that will serve to show signs come from two localities, specifically Prague, Slivenec and Prague, Malá Chuchle and are stored in the National Museum in the depository in Horní Počernice. For a more complete view of the Cenomanian in the Bohemian Cretaceous Basin are used the descriptions of the locations Prague, Hloubětín and Vyšehořovice. The default method for detecting the paleoclimatic signal is the CLAMP (Climate Leaf Analysis Multivariate Program) analysis, which sets out the approximate climatic conditions that dominated in the Cenomanian. Key words: palaeoclimatology, Cenomanian flora, Bohemian Massif
|
guest ::
RSS feed.