The Tereñes Formation or Tereñes Marl is a Late Jurassic (Kimmeridgian) geologic formation in Asturias, Spain. The grey marls of the formation were deposited in a lagoonal environment at a muddy coast along a temporary inland sea. The lower section of the formation comprises silty and chalky sandstones with desiccation cracks and ripple marks, then becomes a bituminous, prominently ostracod-bearing, pelecypod shell chalk, lime chalk marl and marl.Tereñes Formation at Fossilworks.org Fossil tracks have been reported from the formation. The Terenes and Lastres Formations are regarded as lateral equivalents.
Fossil content The following fossils were reported from the formation: Dinosaurs Theropoda indet.Ruiz Omeñaca et al., 2012 ?Allosauroidea indet. Neosauropoda indet.Ruiz Omeñaca et al., 2007 Ankylopollexia indet. Crocodylimorphs Dakosaurus sp.Ruiz Omeñaca et al., 2010 cf. Machimosaurus sp.Young et al., 2014 Ichnofossils Gigantosauropus asturiensisMensink & Mertmann, 1984 Hispanosauropus hauboldi
See also List of dinosaur-bearing rock formations List of stratigraphic units with sauropodomorph tracks Sauropod tracks
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