Cerro del Pueblo Formation

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Cerro del Pueblo Formation
Stratigraphic range: Campanian
~73.6–72.7  Ma
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Cerro del Pueblo Coahuila.jpg
Type Geological formation
Unit of Difunta Group
Underlies Cerro Huerta Formation
Overlies Parras Shale
Thickness160 m (520 ft)
Lithology
Primary Mudstone, sandstone
Other Siltstone, conglomerate, limestone
Location
Coordinates 26°06′N101°06′W / 26.1°N 101.1°W / 26.1; -101.1
Approximate paleocoordinates 32°12′N75°30′W / 32.2°N 75.5°W / 32.2; -75.5
Region Coahuila
Country Mexico
Extent Parras Basin
Mexico topographic map-blank 2.svg
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Cerro del Pueblo Formation (Mexico)
Mexico Coahuila location map.svg
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Cerro del Pueblo Formation (Coahuila)
Paleogeography of the Campanian North america 75mya.png
Paleogeography of the Campanian
Outcrops of the Cerro del Pueblo Formation at the type locality of Cerro del Pueblo, on the edge of Saltillo, Coahuila Cerro del Pueblo Formation by Nick Longrich.jpg
Outcrops of the Cerro del Pueblo Formation at the type locality of Cerro del Pueblo, on the edge of Saltillo, Coahuila

The Cerro del Pueblo Formation is a geological formation in Saltillo, capital city of the state of Coahuila, Mexico, whose strata date back to the latest Campanian of the Late Cretaceous, just before the Campanian-Maastrichtian boundary. Dinosaur remains are among the fossils that have been recovered from the formation. [1] The formation is believed to correlate with the Baculites reesidesi and Baculites jenseni ammonite zones, which dates it to 73.63-72.74 Ma. [2]

Contents

Fragments of a hadrosaur skeleton weathering out of the Cerro del Pueblo Formation near Rincon Colorado, Coahuila Cerro del Pueblo hadrosaur bone.jpg
Fragments of a hadrosaur skeleton weathering out of the Cerro del Pueblo Formation near Rincon Colorado, Coahuila

The Cerro del Pueblo Formation includes marine, brackish, and non-marine environments, and was laid down in a coastal lowland environment, with Coahuila being on the edge of the Western Interior Seaway at the time. Fossils are abundant in the Cerro del Pueblo Formation, and include dinosaurs and other vertebrates, plants and seeds, and invertebrates including oysters, snails, and other molluscs. The formation is underlain by the Parras Shale and is overlain by the Cerro Huerta Formation.

Dinosaurs

Ornithischians

Remains of the following ornithischians have been found in the formation: [3]

Ankylosaurs

Ankylosaurs of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Ankylosauria [3] Indeterminate [3] A femur fragment, phalanx and a possible osteoderm. [3] Indeterminate ankylosaur remains. [3]
Ankylosauridae [3] Indeterminate [3] Osteoderms. [3] Indeterminate ankylosaurid remains. [3]
Nodosauridae [3] Indeterminate [3] A caudal vertebra, osteoderms and a tooth. [3] Indeterminate nodosaurid remains. [3]

Ceratopsians

Ceratopsians of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Centrosaurinae [3] Indeterminate [3] A partial right squamosal. [3] Probably represents a new taxon. [3]
Ceratopsidae [3] Indeterminate [3] Squamosal fragment, metatarsal, metacarpal, sacral vertebrae, proximal end of femora, proximal end of ulna, possible frill fragments and teeth. [3] Indeterminate ceratopsid remains. [3]
Chasmosaurinae [3] Indeterminate [3] Supraorbital horncores, an orbit, dorsal vertebra, indeterminate cranial fragments, limb bones, and unspecified postcranial elements pertaining to juvenile specimens. [3] Indeterminate chasmosaurine remains belonging to juvenile specimens. [3]

Ornithopods

Ornithopods of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Coahuilasaurus [4] C. lipani [3] A kritosaurin hadrosaurid
Coahuilasaurus Life reconstruction of Coahuilasaurus.png
Coahuilasaurus
Latirhinus Life reconstruction of Latirhinus uitstlani.png
Latirhinus
Tlatolophus Tlatolophus.png
Tlatolophus
Velafrons Life reconstruction of Velafrons coahuilensis.png
Velafrons
Hadrosauridae [3] Indeterminate [3] A braincase, postorbital, quadrate, laterosphenoid, dentaries, mandibles, maxillae, cervical vertebrae, dorsal vertebrae, sacral vertebrae, caudal vertebrae, neural spines, ribs, ilium, femora, fibulae, tibiae, humeri, ulnae, metatarsals, metacarpals, pedal phalanxes, pedal phalanges, pedal ungula, phalanges, phalanxes, various bone fragments, fibulae, scapulae, radii, coracoids, astragali, indeterminate pelvic bones, ossified tendons, isolated teeth and integumentary impressions. [3] Indeterminate hadrosaurid remains from numerous specimens. [3]
Kritosaurus [5] K. navajovius [5] Predentary, symphyseal processes, rostral portion of dental battery of dentaries, rostral region of premaxillae, and fragments of maxilla. [5] A kritosaurin hadrosaurid, originally referred to K. navajovius, [5] but reclassified to Coahuilasaurus .
Lambeosaurinae [3] Indeterminate [3] Maxillae, premaxillae, quadrate, partial braincase, dentaries, cervical vertebrae, dorsal vertebrae, sacral vertebrae, caudal vertebrae, neural spines, ribs, ilia, ischium, femora, fibulae, tibiae, humeri, ulnae, metatarsals, metacarpals, pedal phalanges, phalanges, pedal unguals, astragali, radii, scapulae, pubes and other unprepared elements. [3] Indeterminate lambeosaurine remains from numerous specimens, including a large hadrosaurid. [3]
Latirhinus [6] L. uitstlani [6] Caudal vertebrae, scapulae, humeri, ulnae, coracoid, metacarpals, manual ungual, ilia, ischia, femora, tibiae, fibula, and astragalus. [6] Holotype specimen is chimeric as it consists of multiple individuals. Some material from the holotype specimen is assigned to Lambeosaurinae indet. and Saurolophinae indet.. [7]
Saurolophinae [3] Indeterminate [3] A braincase, brain endocast, dentaries, maxillae, cervical vertebrae, dorsal vertebrae, sacral vertebrae, caudal vertebrae, chevrons, neural spines, ribs, ilium fragments, femora, fibulae, tibiae, humeri, ulnae, metatarsals, phalanges, phalanxes, scapulae, a possible coracoid, radii, ossified tendons, and undescribed juvenile specimens. [3] Indeterminate saurolophine remains from numerous specimens, including juvenile individuals. [3]
Tlatolophus [8] T. galorum [8] An almost complete skull, mandible, partial ilium, partial ischium, a femur, scapula, coracoid, sacral vertebrae, caudal vertebrae, and chevrons. [8] A parasaurolophin hadrosaur, closely related to Charonosaurus and Blasisaurus . [8]
Velafrons [9] V. coahuilensis [9] Dentaries, predentaries, ceratobranchial, premaxillae, maxillae, jugal, quadrate, nasal, skull roof, cervical vertebrae, dorsal vertebrae, sacral vertebrae, caudal vertebrae, neural arches, cervical ribs, ribs, chevrons, scapula, coracoids, humeri, ulnae, radii, metacarpals, manual phalanges, ilium, ischia, pubes, femora, tibiae, astragalus, metatarsals and pedal phalanges. [9] A lambeosaurine hadrosaurid known only from a juvenile specimen. [9]

Thescelosaurids

Thescelosaurids of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Thescelosauridae [10] Indeterminate [10] A right premaxillary tooth and a posterior sacral vertebral centrum. [10] Indeterminate thescelosaurid remains. [10]

Saurischians

Remains of the following saurischians have been found in the formation: [3]

Theropods

Coelurosaurs
Coelurosaurs of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
cf. Richardoestesia [3] Indeterminate [3] A tooth. [3] A taxon only known from teeth. [3]
Dromaeosaurs
Dromaeosaurs of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Dromaeosaurinae [3] Indeterminate [3] A pedal ungual and dentary teeth. [3] Indeterminate dromaeosaurine remains. [3]
Saurornitholestinae [3] Indeterminate [3] A pedal ungual, manual unguals and teeth. [3] Indeterminate saurornitholestine remains. [3]
Oviraptorosaurs
Oviraptorosaurs of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Caenagnathidae 3 tibia fragments, distal, proximal and medial shaft elements respectively. [11] An oviraptorosaur. Two different morphotypes are suggested, a small one, less than a meter in length. And a big morphotype, almost reaching two meters.
Ornithomimosaurs
Ornithomimosaurs of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Mexidracon [12] M. longimanus [3] A partial skeletonA ornithomimid theropod
Mexidracon longimanus.png
Paraxenisaurus [13] P. normalensis [13] Caudal vertebrae, femur, peses, manual phalanxes, manual ungual, tarsals, metatarsals, metacarpals, pedal phalanx, pedal phalanges, and pedal unguals. [13] Represents the first known deinocheirid from North America. [13]
Paraxenisaurus Manual Claw.jpg
"Saltillomimus""S. rapidus"Partial skeleton. [14] An informally named ornithomimosaur. [14] Saltillomimus rapidus.jpg
Tyrannosaurs
Tyrannosaurs of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Labocania [15] L. aguillonae [3] A teratophonein tyrannosaurine
Labocania aguillonae.png
Tyrannosauridae [3] Indeterminate [3] A caudal vertebra, indeterminate vertebrae, tibia, fibula, fragments of ungual phalanges, phalanges, and teeth. [3] Indeterminate tyrannosaurid remains. [3]
Other theropods
Theropods of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Theropoda [3] Indeterminate [3] A neural arch, complete and fragmented pedal and manual phalanxes, manual unguals, unspecified vertebra, complete and fragmented caudal vertebrae, chevron, proximal end of femur, and unidentified bone fragments. [3] Indeterminate theropod remains. [3]
Troodontidae [3] Indeterminate [3] A pedal phalanx and a tooth. [3] Indeterminate troodontid remains. [3]

Other Fossils

Pterosaurs

Pterosaurs of the Cerro del Pueblo Formation
TaxaPresenceDescriptionImages
Ichnogenus:Saltillo, Coahuila [16] Specimens kept at the Dinosaur Tracks Museum, of the University of Colorado at Denver and the Secretaría de Educación Pública de Coahuila, Mexico; [16] might also represent Haenamichnus . [17]

Turtles

Turtles of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Mexichelys [18] M. coahuilaensisNew genus for Euclastes coahuilaensis, sea turtle
Chedighaii [19] C. hutchisoniA bothremydid turtle
Yelmochelys [20] Y. rosarioaeA stem-kinosternid turtle
Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Other vertebrates

Fish

Fish of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Lepisosteus L. sp.
Amiidae Indet.

Fossil eggs

Mammals

Mammals of the Cerro del Pueblo Formation
GenusSpeciesMaterialNotesImages
Cimolomyidae indet.A cimolomyid multituberculate. [14]
Pediomys P. cf. elegansA pediomyid tribosphenidan. [14]
Taeniolabidoidae indet.A taeniolabidoid multituberculate. [14]
Turgidodon T. cf. russelliAn alphadontid marsupialiform. [14]

See also

References

  1. Weishampel et al., 2004, pp.574-588
  2. Fowler, Denver Warwick (2017-11-22). "Revised geochronology, correlation, and dinosaur stratigraphic ranges of the Santonian-Maastrichtian (Late Cretaceous) formations of the Western Interior of North America". PLOS ONE. 12 (11): e0188426. Bibcode:2017PLoSO..1288426F. doi: 10.1371/journal.pone.0188426 . ISSN   1932-6203. PMC   5699823 . PMID   29166406.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Ramírez-Velasco, A. A.; Hernández-Rivera, R. (2015). "Diversity of late cretaceous dinosaurs from Mexico" (PDF). Boletín Geológico y Minero. 126 (1): 63–108.
  4. Longrich, N.R.; Ramirez Velasco, A.A.; Kirkland, J.; Bermúdez Torres, A.E.; Serrano-Brañas, C.I. (2024). "Coahuilasaurus lipani, a New Kritosaurin Hadrosaurid from the Upper Campanian Cerro Del Pueblo Formation, Northern Mexico". Diversity. 16 (9): 531. doi: 10.3390/d16090531 .
  5. 1 2 3 4 Prieto-Márquez, A. (2013). "Skeletal morphology of Kritosaurus navajovius (Dinosauria:Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini". Journal of Systematic Palaeontology. 12 (2): 133–175. Bibcode:2014JSPal..12..133P. doi:10.1080/14772019.2013.770417. S2CID   84942579.
  6. 1 2 3 Prieto-Márquez, Albert; Serrano Brañas, Claudia Inés (2012). "Latirhinus uitstlani, a 'broad-nosed' saurolophine hadrosaurid (Dinosauria, Ornithopoda) from the late Campanian (Cretaceous) of northern Mexico". Historical Biology. 24 (6): 607–619. Bibcode:2012HBio...24..607P. doi:10.1080/08912963.2012.671311. S2CID   128964878.
  7. Ángel Alejandro Ramírez-Velascoa; Jesús Alvarado-Ortegab (2021). "Review of the taxonomic affinities of Latirhinus uitstlani, an emblematic Mexican hadrosaurid" . Journal of South American Earth Sciences. 110. Bibcode:2021JSAES.11003391R. doi:10.1016/j.jsames.2021.103391.
  8. 1 2 3 4 Ramírez-Velasco, Á. A.; Aguilar, F. J.; Hernández-Rivera, R.; Gudiño Maussán, J. L.; Rodriguez, M. L.; Alvarado-Ortega, J. (2021). "Tlatolophus galorum, gen. et sp. nov., a parasaurolophini dinosaur from the upper Campanian of the Cerro del Pueblo Formation, Coahuila, northern Mexico". Cretaceous Research . 126: Article 104884. Bibcode:2021CrRes.12604884R. doi:10.1016/j.cretres.2021.104884.
  9. 1 2 3 4 Gates, Terry A.; Sampson, Scott D.; Delgado de Jesús, Carlos R.; Zanno, Lindsay E.; Eberth, David; Hernandez-Rivera, René; Aguillón Martínez, Martha C.; Kirkland, James I. (2007). "Velafrons coahuilensis, a new lambeosaurine hadrosaurid (Dinosauria: Ornithopoda) from the Late Campanian Cerro del Pueblo Formation, Coahuila, Mexico". Journal of Vertebrate Paleontology. 27 (4): 917–930. doi:10.1671/0272-4634(2007)27[917:VCANLH]2.0.CO;2. S2CID   86157621.
  10. 1 2 3 4 Rivera-Sylva, Héctor E.; Frey, Eberhard; Stinnesbeck, Wolfgang; Amezcua, Natalia; Flores, Flores Huert (2018). "First occurrence of Parksosauridae in Mexico, from the Cerro del Pueblo Formation (Late Cretaceous; late Campanian) at Las Águilas, Coahuila". Boletín de la Sociedad Geológica Mexicana. 70 (3): 779–784. doi: 10.18268/BSGM2018v70n3a10 . S2CID   202193814.
  11. Serrano-Brañas, Claudia Inés; Espinosa-Chávez, Belinda; Maccracken, S. Augusta; Guevara, Daniela Barrera; Torres-Rodríguez, Esperanza (2022-09-30). "First record of caenagnathid dinosaurs (Theropoda, Oviraptorosauria) from the Cerro del Pueblo Formation (Campanian, Upper Cretaceous), Coahuila, Mexico". Journal of South American Earth Sciences. 119: 104046. Bibcode:2022JSAES.11904046S. doi: 10.1016/j.jsames.2022.104046 . ISSN   0895-9811.
  12. Serrano-Brañas, Claudia Inés; Espinosa-Chávez, Belinda; de León-Dávila, Claudio; Maccracken, S. Augusta; Barrera-Guevara, Daniela; Torres-Rodríguez, Esperanza; Prieto-Márquez, Albert (2025-01-28). "A long-handed new ornithomimid dinosaur from the Campanian (Upper Cretaceous) Cerro del Pueblo Formation, Coahuila, Mexico" . Cretaceous Research : 106087. doi:10.1016/j.cretres.2025.106087. ISSN   0195-6671.
  13. 1 2 3 4 Serrano-Brañas, Claudia Inés; Espinosa-Chávez, Belinda; Maccracken, S. Augusta; Gutiérrez-Blando, Cirene; de León-Dávila, Claudio; Ventura, José Flores (April 2020). "Paraxenisaurus normalensis, a large deinocheirid ornithomimosaur from the Cerro del Pueblo Formation (Upper Cretaceous), Coahuila, Mexico". Journal of South American Earth Sciences. 101: 102610. Bibcode:2020JSAES.10102610S. doi:10.1016/j.jsames.2020.102610. S2CID   218968100.
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  15. Rivera-Sylva, Héctor E.; Longrich, Nicholas R. (2024). "A New Tyrant Dinosaur from the Late Campanian of Mexico Reveals a Tribe of Southern Tyrannosaurs". Fossil Studies. 2 (4): 245–272. doi: 10.3390/fossils2040012 .
  16. 1 2 3 Lockley, M.; Harris, J.D.; and Mitchell, L. 2008. "A global overview of pterosaur ichnology: tracksite distribution in space and time." Zitteliana. B28. p. 187-198. ISSN   1612-4138.
  17. Witton, Mark P.; Naish, Darren; McClain, Craig R. (28 May 2008). "A Reappraisal of Azhdarchid Pterosaur Functional Morphology and Paleoecology". PLOS ONE. 3 (5): e2271. Bibcode:2008PLoSO...3.2271W. doi: 10.1371/journal.pone.0002271 . PMC   2386974 . PMID   18509539.
  18. James F. Parham; Nicholas D. Pyenson (2010). "New Sea Turtle from the Miocene of Peru and the Iterative Evolution of Feeding Ecomorphologies since the Cretaceous". Journal of Paleontology. 84 (2): 231–247. Bibcode:2010JPal...84..231P. doi:10.1666/09-077R.1. S2CID   62811400.
  19. Gaffney, Eugene S.; Tong, Haiyan; Meylan, Peter A. (Peter Andre) (2006). "Evolution of the side-necked turtles : the families Bothremydidae, Euraxemydidae, and Araripemydidae; Bulletin of the American Museum of Natural History, no. 300". American Museum of Natural History.
  20. Don Brinkman; Martha Carolina Aguillon-Martinez; J. Howard Hutchison; Caleb M. Brown (2016). "Yelmochelys rosarioae gen. et sp. nov., a stem kinosternid (Testudines; Kinosternidae) from the Late Cretaceous of Coahuila, Mexico". PaleoBios. 33: 1–20.

Bibliography

Further reading