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Abstract
The Lower Oligocene Gornji Grad beds from Poljšica pri Podnartu consist of marly limestone, mudstone, several layers of limestones and two layers of sandstones, and were deposited on a mixed carbonate-siliciclastic ramp. Especially the limestones contain rich fossil fauna and non-geniculate coralline red algae. These were systematically collected from four horizons and researched in thin sections under an optical microscope. Genera Lithoporella, Neogoniolithon, Spongites, Lithothamnion, Mesophyllum and Spongites were recognized. Surface area for each genus was calculated and the differences in the coralline assemblages in the four horizons were analysed. The corallines originate from two source areas: sandy-muddy bottom of a shallow marine environment, and small coral bioherms with its encrusters.
Highlights
The westernmost outcrops of the Lower Oligocene Gornji Grad beds in Slovenia can be found near Bohinj (HERLEC, 1985), from where minor bodies of limited size extend further to the east (GRAD & FERJAN~I~, 1976; MIO~, 1978, 1983; BUSER, 1979; PREMRU, 1983; BUSER, 1986; JURKOV{EK, 1987)
This paper summarizes the author’s research from Polj{ica and deals with: (1) the systematic description and identification of non-geniculate coralline red algae from Polj{ica pri Podnartu and (2) the analysis of the coralline red algal as
The Paleogene beds from Polj{ica pri Podnartu were deposited during a long term eustatic sea level rise, accompanied with a tectonic subsidence of the area, which resulted in the formation of the Slovenian Paleogene Basin, which is a part of the Central Paratethys (RÖGL, 1998; NEBELSICK et al, 2000; SCHMIEDL et al, 2002)
Summary
The westernmost outcrops of the Lower Oligocene Gornji Grad beds (informal lithostratigraphic unit) in Slovenia can be found near Bohinj (HERLEC, 1985), from where minor bodies of limited size extend further to the east (GRAD & FERJAN~I~, 1976; MIO~, 1978, 1983; BUSER, 1979; PREMRU, 1983; BUSER, 1986; JURKOV{EK, 1987). Deposition of the Gornji Grad beds corresponds to a gradual tectonic subsidence of the area, as well as to a long term eustatic sea-level rise (RÖGL, 1998; JELEN et al, 1998; NEBELSICK et al, 2000; SCHMIEDL et al, 2002). HEMLEBEN (1964) divided Oligocene beds in the Gornji Grad area into four units: Basal unit (1) consists of conglomerates, mudstones and sandstones, deposited in the braided river (BRUCH, 1998) or in the deltaic environment (SCHMIEDL et al, 2002). The thickness of the Basal unit is between few to 400 m (HEMLEBEN, 1964; NEBELSICK et al, 2000) They discordantly overlie rocks of Triassic age (HEMLEBEN, 1964)
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