File:Arietenpflaster-Bodelshausen Ammoniten Jura-Flachmeer Baden-Wuerttemberg.jpg

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Deutsch: Arietenpflaster von Bodelshausen in Baden-Württemberg.

Bildauszug einer 3,5 m auf 2,4 m großen Steinplatte in der Paläontologischen Sammlung der Universität Tübingen. Der Zollstock zeigt die Maße 40 auf 50 cm. Es handelt sich um Ammoniten (Ammonoidea), eine sehr artenreicheTeilgruppe der ausschließlich marin lebenden Kopffüßer. Die Exemplare der Gesteinsplatte sind bis zu 70 cm groß. Sie wurden in der Arietenkalk-Formation (Unterjuraschicht Lias alpha3, Alter unter 200 Millionen Jahre (Ma)) gefunden. Es sind Verwandte von Tintenfischen, die jedoch schon am Ende der Kreidezeit (mehr als 65 Ma) ausgestorben sind. Links im Bild ist das sich deutlich unterscheidende Gehäuse eines fossilen Tieres aus der Gattung der Nautiliden zu sehen, von denen es auch heute noch Arten gibt.

Die eindrucksvolle Anhäufung von Gehäusen von Arieten und auch einigen Nautiliden im Arietenpflaster geht auf nachträgliche Zusammenschwemmung im bewegten Flachmeer zurück. Eine ähnliche Anhäufung findet sich als Naturdenkmal im Bach der Steinlach in Ofterdingen.

English: Arietenpflaster von Bodelshausen, (near Tübingen), detail (ruler 40 cm, 50 cm) of a 3,5 m to 2,4 m stone plate in the Paleontological Collection of the University of Tübingen. These Ammonites are an extinct group of marine invertebrate animals in the class Cephalopoda, here found in Early Jurassic ("Arietenkalk-Formation" Lias alpha3, age less than 200 million years (Ma)). The stone plate has fossils up to 70 cm. The fossile on the left is a marine mollusc of the subclass nautiloidea, of which there are still living species. The accumulation of Ammonites is a natural result of flows in a flat marine sea.
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current21:53, 10 June 2015Thumbnail for version as of 21:53, 10 June 20151,800 × 1,200 (2.09 MB)Ustill (talk | contribs)User created page with UploadWizard

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