Naslov
Badenian echinoids from the Mt. Medvednica and their ecological niches

Autori
Mikša, Goran ; Sremac, Jasenka ; Zečević, Marko ; Pezelj, Đurđica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
1. slovenski geološki kongres, Knjiga povzetkov. / Horvat, A. ; Košir, A. ; Vreča, P. ; Brenčić.M. - Ljubljana : Geološki zavod Slovenije, 2002

Skup
1. slovenski geološki kongres

Mjesto i datum
Črna na Koroškem, Slovenija, 09.10.2002. - 11.10.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Badenian; echinoids; ecological niches; Mt. Medvednica

Sažetak
Irregular echinoids from the Badenian sediments at localities Bizek and Borovnjak in SW Mt. Medvednica were studied. Genera Clypeaster, Echinolampas, Scutella, Schizaster, Heteroclypeus and Spatangus were determined. Medium-sized to large tropical sand dollars predominate in sandstone and Lithothamnium limestone at Bizek quarry. Their appearance in different sediments, and within different microfossil communities, indicate their tolerance to different environmental conditions. Number of specimens decreases in argillaceous sediments and marls. Associated microfauna consists of benthic foraminifers, with predominance of epifaunal taxa - herbivore, or filter-feeders. Only two species of sand dollars (Clypeaster cf. sequenzai and Scutella cf. vindobonensis) were found in nearshore sandstone at Borovnjak. Medium-sized cassiduloids (Echinolampas lecointrae and E. cf. wrighty) were determined from both localities, in association with predominantly miliolid foraminifers. Echinolampas cf. wrighty is always accompanied with Scutella cf. vindobonensis in highly energetic environments at Borovnjak. Heteroclypeus was found in Lithothamnium limestone at Bizek quarry. Spatangus was collected from grey marls at the same locality, accompanied with benthic foraminifers (Cibicides, Cibicidoides), sponge spiculas and well preserved molluscs, indicating deeper, low-energy water. Schizaster parkinsoni, associated with numerous infaunal foraminifers was found in sandstone and argillaceous sandstone at Borovnjak locality. Turbulent nearshore environment, with oscillations in salinity (appearance of brachish ostracods)was presumed.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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