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Taksonomske raziskave oligocenskih in miocenskih lesov v Sloveniji : magistrsko delo = taxonomical research of Oligocene and Miocene woods from Slovenia : M. Sc. ThesisKrižnar, MatijaPaleobotanične raziskave so v Sloveniji dokaj pogoste, vendar obsežnejših raziskav fosilnih lesov doslej še ni bilo. V literaturi je moč zaslediti le nekaj prispevkov vendar, večinoma brez slikovnega ... gradiva in natančnih opisov lesa. Na osnovi terenskih raziskav v Kamnišiki Bistrici, Tunjiškem gričevju, okolici Moravč in v Zasavju smo pripravili zbirko oligocenskih in miocenskih lesov. Na raziskanih nahajališčih smo lahko zbirali tudi druge fosilne ostanke (npr. mehkužce, vretenčarje in razne rastlinske ostanke), ki so nam pomagali določiti starost nahajališč fosilnega lesa. Primerke fosilnih lesov smo tanko zbrusili in izdelali mikroskopske vzorce za proučevanje ksilotomskih znakov. Naredili smo opise posameznih vzorcev in les s pomočjo ksilotomskih ključev taksonomsko opredelili. Iz oligocenskih plasti Kamniške Bistrice in premogovega člena Zasavja smo določili les različnih iglavcev: Taxodioxylon gypsaceum, Taxodioxylon sp., cf. Taxodioxylon, Glyptostroboxylon sp., Tetraclinoxylon cf. vulcanense in iz družine Cupressaceae (cipresovke). Edini listavec je pripadal rodu Castanoxylon sp. Glede na izbor vrst sklepamo, da so drevesa uspevala v oligocenski klimi, ki je bila verjetno subtropska s povprečno letno temperaturo okoli l7°C. Po koncu sedimentacije premogovega člena se je klima v Zasavju verjetno nekoliko spremenila, čemur priča tudi najdba vrste Tetrapterys harpyarum, ki je pogosta v tropskih predelih še danes. Miocenske lesove iz nahajališč v Tunjiškem gričevju in okolici Moravč smo pripisali rodovom in vrstam: Euphorbioxylon sp., Laurinoxylon sp., Cinnamomoxylon cf. aerolosum, Carapoxylon xylocarpoides, Carapoxylon aff. ornatum, Capparidoxylon cf. holleisii in cf. Myricoxylon. Fosilni les iglavcev pa je bil iz družine Taxodiaceae (taksodijevke) in iz rodu Taxodioxylon. Glede na najdeni les sklepamo, da so drevesa uspevala v tropski ali subtropski z visokimi povprečnimi letnimi temperaturami. Tudi druge paleontološke najdbe nakazujejo, da se klimatska slika skozi spodnji miocen lahko primerja s klimo na področju Centralne Paratetide.Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Križnar], jun. 2009Language - slovenianCOBISS.SI-ID - 779358
Author
Križnar, Matija
Other authors
Pavšič, Jernej |
Herlec, Uroš
Topics
paleobotanika |
taksonomske raziskave |
Oligocen |
Miocen |
fosilni les
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Library/institution |
City | Acronym | For loan | Other holdings |
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NTF, Department of Geology, Ljubljana | Ljubljana | NTFGEO |
outside loan 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Križnar, Matija | 37980 |
Pavšič, Jernej | 02206 |
Herlec, Uroš | 11229 |
Source: Personal bibliographies
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