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Lithology of Tertiary beds in Kozjansko, Eastern Slovenia

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Author(s): Bogoljub Aničić | Bojan Ogorelec | Polona Kralj | Miha Mišič

Journal: Geologija
ISSN 0016-7789

Volume: 45;
Issue: 1;
Start page: 213;
Date: 2002;
Original page

Keywords: clastites | volcanic and volcaniclastic rocks | carbonate rocks | Oligocene | Miocene | petrology | Kozjansko area | Slovenia

ABSTRACT
Oligocene and Miocene beds in Kozjansko, SW part of the Parathetys region, were developed in the time span ranging from Kiscellian to Pannonian, with two emersion phases – the first in Ottnangian, Karpatian and partially Badenian, and the second in Badenian and Sarmatian. Kiscellian sedimentation started with basal conglomerate, which was followed by sand, marl with coal seams, and marly clay (sivica). Clastic sedimentation was accompanied by volcanic activity that produced andesites, dacites, and andesitic,dacitic and rhyolitic tuffs. Egerian deposits include sands, sandstones, siltstones, claystones,marls and tuffs (the Govce beds). Eggenburgian deposits are characterised by quartztoze and gluconitic sandstones (the Macelj sandstones) and conglomerates. Badenian deposits are among the most widespread in occurrence and the most diverse in development. Theyare known as the Laško beds. Marls and siltstones predominate over massive lithothamnian limestone, calcareous-quartztoze conglomerate and biocalcarenite. They contain marine fauna. Badenian tuffs have been newly discovered on the territory of Kozjansko. InSarmatian, the environment changed from marine to brakish and freshwater. Transgressively deposited conglomerate is overlain by sand, marl, sandstone and scarce beds of marly limestone. Clastic sedimentation continued in the Pannonian time, too.

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