Marnes Rouges Inférieures Formation
Stratigraphic range: Maastrichtian ~70–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Calcaires de Vignevieille
Overlies	Grès d'Alet
Thickness	Over 150 m (490 ft)
Lithology
Primary	Mudstone
Other	Sandstone
Location
Coordinates	42°54′N 2°18′E / 42.9°N 2.3°E / 42.9; 2.3
Approximate paleocoordinates	34°48′N 2°00′E / 34.8°N 2.0°E / 34.8; 2.0
Region	Occitania
Country	France
Type section
Named for	French: "Lower Red Marls"
Marnes Rouges Inférieures Formation (France)

The Marnes Rouges Inférieures Formation is a Late Cretaceous geologic formation found in the French Pyrenees. It predominantly consists of red mustone, with minor brown mudstone and sandstone.^[1] Dinosaurs, dinosaur eggs and avialian stem-birds have been reported from the formation.^[2]

• Allodaposuchus precedens
• Ampelosaurus atacis
• Foxemys mechinorum
• Gargantuavis philoinos
• Lirainosaurus astibiae
• Rhabdodon priscus

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with dinosaur trace fossils
    • Dinosaur eggs

• Fondevilla, Víctor; Dinarès-Turell, Jaume; Vila, Bernat; Le Loeuff, Jean; Estrada, Rita; Oms, Oriol; Galobart, Àngel (2016), "Magnetostratigraphy of the Maastrichtian continental record in the Upper Aude Valley (northern Pyrenees, France): Placing age constraints on the succession of dinosaur-bearing sites", Cretaceous Research, 57: 457–472, doi:10.1016/j.cretres.2015.08.009
• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21