Title Information

Münchner Geowissenschaftliche Abhandlungen
Reihe A: Geologie und Paläontologie

Volume 18

KÄSTLE, Bernhard: Fauna und Fazies der kondensierten Sedimente des Dogger und Malm (Bajocium bis Oxfordium) im südlichen Frankenjura 1990. [in German] – 134 pp., 63 figures, 6 tables, 14 plates. 29.7 x 21.0 cm. Paperback ISBN 978-3-923871-39-1 Euro 30.00 series: MGA, Reihe A: Geologie und Paläontologie order now

Abstract

In the quarry of Sengenthal (Neumarkt/Opf., Bavaria) a profile beginning at the Eisensandstein (upper Aalenian ?) and ending in the lower Weißjura (upper Oxfordian) was examined stratigraphically, faunistic and facially. Parts of the fauna has been examined systematically.

Four horizons of reworking and erosions coursed by regressions are documented: 1. upper Aalenian / lower Bajocian, 2. middle to upper Callovian, 3. upper Lower Callovian, 4. boundary Lower / Middle Oxfordian.

A continuous grain degression and the degression of clastic particles from the lower to upper parts of the profile are caused by an increasing distance of land and sedimentation area. Within this development the sea level changed between 20 to 100 m.

The regressions found in Sengenthal could also be documented in the profile of Hartmannshof and in a great part of profiles studied in literature.

In the southern Frankenjura in bajocian time a relief caused by tectonics is treated by the facies development and a changing high of the following profiles. At bajocian times the seafloor had a low relief. At the Bajocian and Callovian sedimentation rates most were high, in the Bathonian it generally was low.

Ferrugineus-Ooids were generated autochthonous. Ferrumoxide was transported by limonite enveloped clay minerals. Because of a decreased Fe-transport from land a generation of glauconite in the Ornatenton was possible.

The phosphate of Ornatenton phosphorite nodules probably was transported from land. The nodules growed within the sediment.