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    Publication Date: 2021-04-25
    Description: Im oberen Korallenoolith (Oxford-Kimmeridge) von Oker entwickelten sich kleine lagunäre Riffe, deren Gerüst aus Exogyren, Serpeln und großen einzelnen Korallenstöcken gebildet wurde. Die umgebende Fazies besteht aus stabilen Weichböden mit reicher Molluskenfauna (Nerineen, Lamellibranchiata). Gerüstbildende Algen werden nicht beobachtet. Dasycladaceen sind selten. In Zwickeln, Kleinhöhlen und leeren Exogyren-Schalen siedelte sich eine diverse Poriferen-Fauna an, die von tetractinelliden Demospongiae dominiert wird. Durch Umwandlung von Teilen des Schwammgewebes in Automikrit kam es zu einer in situ Erhaltung vieler Porifera-Skelette (bakterielle Ammonifikation). Neben diesen autigenen Mikritbildungen spielen weitere stromatolithische und thrombolithische Mikrobialithe bei der Stabilisierung der lagunären Patchreefs eine erhebliche Rolle.
    Description: In the uppermost facies of the OxfordianiKimmeridgian "Korallenoolith" of Oker small lagoonal patchreefs are present. They are constructed of exogyrid oysters, serpulids, and large single scleractinians. Framebuilding algae are absend. The surrounding sediments were stable soft bottoms with large numbers of nerineid gastropods and semi-infaunal bivales. Dasycladacean algae are rarely present. Within small caves, empty conches of exogyrids, and inter biogene spaces settled a large number of cryptic sponges (mainly tetractinellid demosponges). Caused by bacterial ammonification part of the sponge soft tissues were altered in automicrite. Therefore the sponge skeletons exhibit more or less their entire shapes. Beside this type of automicrite stromatolitic and and thrombolitic microbialites play an important role in stabilizing the patchreef frame.
    Keywords: Paläontologie: Allgemeines ; 551 ; VU 000 ; 38.20 ; 38.2
    Language: German
    Type: article , publishedVersion
    Format: application/pdf
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