Mexcala Formation

Mexcala Formation
Stratigraphic range: late Turonian-late Maastrichtian ~90–66  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Limestone, sandstone
Other	Marl, shale
Location
Coordinates	18°00′N99°12′W / 18.0°N 99.2°W / 18.0; -99.2
Approximate paleocoordinates	20°30′N71°24′W / 20.5°N 71.4°W / 20.5; -71.4
Region	Guerrero state
Country	Mexico
Type section
Named for	Mexcala
Mexcala Formation (Mexico)

The Mexcala Formation is a Late Cretaceous (late Turonian to late Maastrichtian) geologic formation in Guerrero state, southern Mexico. ^{[1] [2]}

Fossil content

Fossil ornithopod tracks assigned to Hadrosauridae indet. and sauropod tracks have been reported from the formation. ^[3]

Other fossils from the formation include: ^[1]

Ammonites

• Barroisiceras (Texanites) dentatocarinatum ^[4]
• Coilopoceras colleti ^[4]
• C. requienianum ^[4]
• Forresteria (Forresteria) alluaudi ^[4]
• Peroniceras aff. tricarinatum ^[5]
• P. cf. subtricarinatum ^[5]
• Pseudotissotia galliennei ^[4]
• Barroisiceras cf. alstadenense ^[5]
• Barroisiceras sp. ^[5]
• Peroniceras sp. ^[5]

Fish

• Buapichthys gracilis ^[6]

See also

• List of fossiliferous stratigraphic units in Mexico
• List of dinosaur-bearing rock formations
  • List of stratigraphic units with ornithischian tracks
  • Ornithopod tracks
• Mesozoic Mexico-related topics

References

1. Mexcala Formation at Fossilworks.org
2. BioOne Online Journals: "Early MAASTRICHTIAN MOLLUSCA from the MEXCALA FORMATION of the State of GUERRERO, Southern MEXICO"
3. Weishampel et al., 2004, "Dinosaur distribution", pp.517-607
4. González Arreola, 1977
5. Cabral Cano et al., 2000
6. Medina-Castañeda, C. I.; Cantalice, K. M.; Castañeda-Posadas, C. (2025). "A new crossognathiform fish (Teleostei: †Crossognathiformes) from San José de Gracia quarry reveals a great diversity in the Cretaceous outcrops of Mexico". Cretaceous Research. 166. 106026. doi:10.1016/j.cretres.2024.106026.

Bibliography

• A. A. Ramírez Velasco, R. Hernández Rivera, and R. Servin Pichardo. 2014. The hadrosaurian record from Mexico. In D. A. Eberth & D. C. Evans (ed.), Hadrosaurs 340–360
• 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
• S. Kiel and M. d. C. Perrilliat. 2001. New gastropods from the Maastrichtian of the Mexcala Formation in Guerrero, southern Mexico, part 1: Stromboidea. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 222(3):407-426
• E. Cabral Cano, H. R. Lang, and C. G. A. Harrison. 2000. Stratigraphic Assessment of the Arcelia-Teloloapan area, Southern Mexico: Implications for Southern Mexico's Post-Neocomian Tectonic Evolution. Journal of South American Earth Science 13:443-457
• M. C. Perrilliat, F.J. Vega, and R. Corona. 2000. Early Maastrictian mollusca from the Mexcala formation of the state of Guerro, southern Mexico. Journal of Paleontology 74(1):7-24
• I. Ferrusquia Villafranca, E. Jimenes Hidalgo, and V. M. Bravo Cuevas. 1995. Jurassic and Cretaceous dinosaur footprints from Mexico: additions and revisions. Journal of Vertebrate Paleontology 15(3, suppl.):28A
• C. González Arreola. 1977. Amonitas del Coniaciano (Cretacico superior) de la region de Tepetlapa, estado de Guerrero [Coniacian (Upper Cretaceous) ammonoids from the Tepetlapa region (Guerrero)]. Revista Universidad Nacional Autonoma de Mexico, Instituto de Geologia 1(2):167-173