Tereñes Formation
Introduction 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. Fossil tracks have been reported from the formation.
Fossil content The following fossils were reported from the formation:;Dinosaurs* Theropoda indet. * ?Allosauroidea indet. * Neosauropoda indet. * Ankylopollexia indet. ;Crocodylimorphs* ''Dakosaurus sp. ''* ''cf. Machimosaurus sp. '';Ichnofossils* ''Gigantosauropus asturiensis''* ''Hispanosauropus hauboldi''
See also * List of dinosaur-bearing rock formations** List of stratigraphic units with sauropodomorph tracks*** Sauropod tracks
References === Bibliography ===* * * * *  *