NDLI: Lebensspuren made by Marine Reptiles and their Prey in the Middle Jurassic (Callovian) of Liesberg, Switzerland

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Facies : Volume 38

Facies : Volume 37

Facies : Volume 36

Lebensspuren made by Marine Reptiles and their Prey in the Middle Jurassic (Callovian) of Liesberg, Switzerland

Content Provider	Springer Nature Link
Author	Geister, Jörn
Copyright Year	1998
Abstract	Numerous gutter-like furrows, up to 60 cm wide and up to 9 m long are preserved at the interface “Macrocephalus Beds”/“Callovian Marl” over a surface of 20 by 200 m. They are interpreted as feeding traces made by large marine vertebrates, most likely plesiosaurs and ichthyosaurs searching for food in the lime mud of the shallow Middle Jurassic sea floor. Possible prey animals were infaunal invertebrates (crustaceans) which produced an intricate meshwork of burrows (mainlyRhizocorallium irregulare andThalassinoides) in the bottom sediments, as well as infaunal bivalves.Evidence from cololites of predatory pelagic reptiles (ichthyosaurs, plesiosaurs) as well as reptile regurgitalites indicate that these animals fed not only on fast-swimming vertebrates and cephalopods but also on epi- and endobenthic invertebrates. In addition, the cololites show that the predators ingested considerable amounts of bottom sediment.Different sizes and shapes of the traces suggest that the gutters were produced by different reptiles or age groups. Candidates for the widest gutters are pliosaurs. Of the marine vertebrates known from Jurassic time, only the snout of adult pliosaurs of the genusLiopleurodon was broad enough to produce gutters more than 40 cm wide. Smaller, less than 15 cm wide gutters, could have been made by plesiosauroids or by the narrow pointed snouts of ichthyosaurs.Almost identical traces described from the Oxfordian of Spain and similar but smaller traces from the Lower Devonian of Prague are equally interpreted as feeding traces on the sea floor. Feeding traces of vertebrates in bottom sediments may give detailed information on the hunting behaviour of the predators. However, the attribution of the traces to definite vertebrate taxa remains uncertain.
Starting Page	105
Ending Page	124
Page Count	20
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	39
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Trace Fossils Feeding Traces Vertebrates Marine Saurians Jura Mountains (Switzerland) Jurassic (Callovian) Biogeosciences Geochemistry Paleontology Sedimentology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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Lebensspuren made by Marine Reptiles and their Prey in the Middle Jurassic (Callovian) of Liesberg, Switzerland

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Lebensspuren made by Marine Reptiles and their Prey in the Middle Jurassic (Callovian) of Liesberg, Switzerland