caa a22 4500 445839643 CHVBK 20180317145340.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00015-011-0069-x doi (NATIONALLICENCE)springer-10.1007/s00015-011-0069-x First record of the leptonectid ichthyosaur Eurhinosaurus longirostris from the Early Jurassic of Switzerland and its stratigraphic framework [Elektronische Daten] [Achim Reisdorf, Michael Maisch, Andreas Wetzel] An incomplete skull of the leptonectid ichthyosaur Eurhinosaurus longirostris found in the Rietheim Member (previously "Posidonienschiefer”; Toarcian, Early Jurassic) of Staffelegg, Canton Aargau, is the first record from Switzerland of this taxon and supports the status of Eurhinosaurus longirostris as a palaeobiogeographic very widespread ichthyosaur species in the Early Toarcian of Western Europe. Being from either the Bifrons or Variabilis zone, it is one of the youngest records of Eurhinosaurus and one of the few diagnostic ichthyosaur finds from this time interval. The partial skull is well articulated and preserved three-dimensionally in a carbonate concretion. Both the mode of preservation of the ichthyosaur and an associated ammonoid (Catacoeloceras raquinianum) provided the age of the concretion, which had been collected from scree. Taphocoenosis and taphonomy show the C. raquinianum to be one of few non re-worked fossils recorded from the Early to Late Toarcian boundary (Bifrons/Variabilis zone) of northern Switzerland in general and of this ammonite species in particular. The Toarcian section at Staffelegg differs from other localities where strata of the same age are exposed with respect to facies variations of the Rietheim Member (previously "Posidonienschiefer”, Early Toarcian) and the extraordinarily high thickness of the Gross Wolf Member (previously "Jurensis-Mergel”, Late Toarcian). Swiss Geological Society, 2011 Ichthyosauridae nationallicence Lias nationallicence Toarcian nationallicence Staffelegg Formation nationallicence Catacoeloceras raquinianum nationallicence Reisdorf Achim Geologisch-Paläontologisches Institut, Universität Basel, Bernoullistrasse 32, 4056, Basel, Switzerland aut Maisch Michael Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, 70191, Stuttgart, Germany aut Wetzel Andreas Geologisch-Paläontologisches Institut, Universität Basel, Bernoullistrasse 32, 4056, Basel, Switzerland aut Swiss Journal of Geosciences SP Birkhäuser Verlag Basel 104/2(2011-10-01), 211-224 1661-8726 104:2<211 2011 104 15 https://doi.org/10.1007/s00015-011-0069-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00015-011-0069-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Reisdorf Achim Geologisch-Paläontologisches Institut, Universität Basel, Bernoullistrasse 32, 4056, Basel, Switzerland aut NATIONALLICENCE 700 1- Maisch Michael Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, 70191, Stuttgart, Germany aut NATIONALLICENCE 700 1- Wetzel Andreas Geologisch-Paläontologisches Institut, Universität Basel, Bernoullistrasse 32, 4056, Basel, Switzerland aut NATIONALLICENCE 773 0- Swiss Journal of Geosciences SP Birkhäuser Verlag Basel 104/2(2011-10-01), 211-224 1661-8726 104:2<211 2011 104 15 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 113671377 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer