Resumen de Callovian (Middle Jurassic) benthonic foraminifera from Southwest Germany
Autochthonous phosphoritic nodules in Callovian claystones (“Ornatenton”) from Southern Germany yield foraminiferal faunas consisting of 38 benthonic and one planktonic species, accompanied by many radiolarians and sponge spicules. Most of these species are known to live exclusively in the Late Jurassic sponge reef facies or in single sponges. As the agglutinated foraminiferal tests from the nodules often consist of sponge spicules, they differ from the structure and the morphology of those in the matrix, so the latter alone cannot be supposed to be representative of the formation as a whole. These assemblages, yielding planktonic foraminifers and radiolarians, were deposited in a nearly tropical shallow shelf sea with a Tethyan influence, under conditions of low hydrodynamic energy.
