Mercedes Formation, Uruguay

For other uses, see Mercedes Formation.

Mercedes Formation
Stratigraphic range: Campanian-Maastrichtian ~84–66  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Asencio Formation
Overlies	Guichón Formation
Lithology
Primary	Sandstone
Location
Coordinates	33°24′S58°18′W / 33.4°S 58.3°W / -33.4; -58.3
Approximate paleocoordinates	37°18′S41°24′W / 37.3°S 41.4°W / -37.3; -41.4
Region	Río Negro & Soriano Departments
Country	Uruguay
Extent	Norte Basin
Type section
Named for	Mercedes, Uruguay
Mercedes Formation, Uruguay (Uruguay)

The Mercedes Formation is a Late Cretaceous (Campanian to Maastrichtian) geologic formation of the Norte Basin in Uruguay. Ichnofossils (such as Teisseirei , Uruguay and Monesichnus ) ^[1] and fossil dinosaur eggs have been reported from the formation. ^[2] The formation that reaches a thickness of about 100 metres (330 ft), ^[3] overlies the Guichón Formation and is overlain by the Asencio Formation. ^[4]

See also

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

References

1. Novo Buess, Anaclara (2020). "Trabajo final de licenciatura en geología: "Mapa geológico de la región al sur de la ciudad de Mercedes y caracterización litológica de la formación Asencio"" (PDF). UdelaR, Facultad de Ciencias (in Spanish). Retrieved 14 December 2025.
2. Weishampel et al., 2004, pp.517-607
3. Tofalo et al., 2011, p.616
4. Tofalo et al., 2011, p.617

Bibliography

• Tófalo, Ofelia; Pazos, Pablo J.; Sánchez Bettucci, Leda (2011), "Estudio composicional de sedimentitas silicoclásticas y paleosuelos de la Formación Mercedes (Cretácico Superior), Uruguay", Revista de la Asociación Geológica Argentina , 68: 615–626, retrieved 2020-08-23
• 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

Further reading

• G. Faccio. 1994. Dinosaurian eggs from the Upper Cretaceous of Uruguay. In K. Carpenter, K. F. Hirsch & J. R. Horner (eds.), Dinosaur Eggs and Babies 47-55