The Baños del Flaco Formation is a Late Jurassic to Early Cretaceous (Tithonian to Berriasian geologic formation in central Chile. The formation comprises limestones and sandstones deposited in a shallow marine to fluvial environment. Fossil ornithopod tracks have been reported from the formation.

Among others, the following fossils have been found in the formation:

Ichnofossils

• Camptosaurichnus fasolae
• Iguanodonichnus frenkii
• Ornithopoda indet.
• Theropoda indet.

• Ammonites, echinoderms and bivalves

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with ornithischian tracks
    • Ornithopod tracks
• Arcabuco Formation, contemporaneous ichnofossil-bearing formation in Colombia
• Chacarilla Formation, contemporaneous ichnofossil-bearing formation in northern Chile
• Coihaique Group, contemporaneous fossiliferous formation in the Aysén Basin

• Leonardi, Giuseppe (1994), Annotated Atlas of South America Tetrapod Footprints (Devonian to Holocene) with an appendix on Mexico and Central America, Ministerio de Minas e Energia - Companhia de Pesquisa de Recursos Minerais, Geological Service of Brazil, pp. 1–248, retrieved 2019-03-25
• 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

• C. Salazar and W. Stinnesbeck. 2016. Tithonian–Berriasian ammonites from the Baños del Flaco Formation, central Chile. Journal of Systematic Palaeontology 14:149-182
• A. P. Larrain and L. Biró-Bagóczky. 1985. New Pygurus (Echinodermata: Echinoidea) from the Tithonian of central Chile: first record from the Jurassic of the southern hemisphere. Journal of Paleontology 59(6):1409-1413