Tereñes Formation

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.^[1] Fossil tracks have been reported from the formation.^[2]

Tereñes Formation
Stratigraphic range: Kimmeridgian ~155–151 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Lastres Formation
Overlies	Vega Formation
Thickness	400 metres
Lithology
Primary	Marl
Other	Sandstone
Location
Coordinates	43.5°N 5.2°W / 43.5; -5.2
Approximate paleocoordinates	35.6°N 7.0°E / 35.6; 7.0
Region	Asturias
Country	Spain
Tereñes Formation (Spain) Show map of Spain Tereñes Formation (Asturias) Show map of Asturias

Fossil content

The following fossils were reported from the formation:^[1]

Dinosaurs

• Theropoda indet.^[3]
• ?Allosauroidea indet.^[3]
• Neosauropoda indet.^[4]
• Ankylopollexia indet.^[4]

Crocodylimorphs

• Dakosaurus sp.^[5]
• cf. Machimosaurus sp.^[6]

Ichnofossils

• Gigantosauropus asturiensis^[7]
• Hispanosauropus hauboldi^[7]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with sauropodomorph tracks
    • Sauropod tracks