Title Information

Münchner Geowissenschaftliche Abhandlungen
Reihe A: Geologie und Paläontologie

Volume 23

DARGA, Robert: Geologie, Paläontologie und Palökologie der südostbayerischen unter-priabonen (Ober-Eozän) Riffkalkvorkommen des Eisenrichtersteins bei Hallthurm (nördliche Kalkalpen) und des Kirchbergs bei Neubeuern (Helvetikum) 1992. [in German] – 166 pp., 6 figures, 22 plates. 29.7 x 21.0 cm. Paperback ISBN 978-3-923871-49-0 Euro 40.00 series: MGA, Reihe A: Geologie und Paläontologie order now

Abstract

Litho-, biofacies, as well as palecological analyse of two Lower Priabonian (Upper Eocene) reef complexes (Eisenrichterstein near Hallthurm, Northern Calcareous Alps and Kirchberg near Neubeuern, Helveticum) enable depositional reconstruction models to be established. Based on these analyses, significant deviation from previous models is suggested.

The Eisenrichterstein complex, whose tectonic control has for the first time been identified, constitutes rocks derived from a beach area (conglomerates), a lagoon (calcarenites), and a reef complex (coral limestones and associated rocks).The reef complex is characterized by distinctive bedding and the absence of a reef core. Consequently, the Eisenrichterstein complex can be regarded as a carbonate ramp.

The coral limestones of Kirchberg are olistholithes. The Kirchberg quarry may, therefore, be considered an olisthostrome exposure which is genetically related to the turbiditic Lithothamnium limestones of the Rohrdorf quarry. The geology of the southern margin of the Intrahelvetic High, from which the Kirchberg olisthostrome is derived, can be updated, due to data gathered from the Kirchberg region and the accompanying olistholithes. The depositional model depicts a shelf rimmed with algal bioconstructions.

The qualitative determination of fauna provided evidence of many different taxa (foraminifera, bivalves, gastropods, corals, bryozoans and echinoderms), which are treated in the second part. The corals Stylocoenia polytropostyla n.sp., Astreopora schedakena n.sp., Ewaldocoenia pollaplasia n.sp., Cyathoseris krepidoblasta n.sp. and the gastropod Turritella caecisutilis n.sp. have been newly described.