Cerro del Pueblo Formation

Cerro del Pueblo Formation
Stratigraphic range: Campanian
~
Type Geological formation
Unit of Difunta Group
Underlies Cerro Huerta Formation
Overlies Parras Shale
Thickness 160 m (520 ft)
Lithology
Primary Mudstone, sandstone
Other Siltstone, conglomerate, limestone
Location
Coordinates 26.1°N 101.1°W / 26.1; -101.1
Approximate paleocoordinates 32.2°N 75.5°W / 32.2; -75.5
Region Coahuila
Country Mexico
Extent Parras Basin
Cerro del Pueblo Formation is located in Mexico
Cerro del Pueblo Formation
Cerro del Pueblo Formation (Mexico)
Paleogeography of the Campanian

The Cerro del Pueblo Formation is a geological formation in Coahuila, Mexico whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. The formation is believed to correlate with the Baculites reesidesi and Baculites jenseni ammonite zones, which dates it to 73.63-72.74 Ma.

Dinosaurs

Ornithischians

Remains of the following ornithischians have been found in the formation:

Ankylosaurs

Ankylosaurs of the Cerro del Pueblo Formation
Genus Species Material Notes Images
Ankylosauria Indeterminate A femur fragment, phalanx and a possible osteoderm. Indeterminate ankylosaur remains.
Ankylosauridae Indeterminate Osteoderms. Indeterminate ankylosaurid remains.
Nodosauridae Indeterminate A caudal vertebra, osteoderms and a tooth. Indeterminate nodosaurid remains.

Ceratopsians

Ceratopsians of the Cerro del Pueblo Formation
Genus Species Material Notes Images
Centrosaurinae Indeterminate A partial right squamosal. Probably represents a new taxon.
Ceratopsidae Indeterminate Squamosal fragment, metatarsal, metacarpal, sacral vertebrae, proximal end of femora, proximal end of ulna, possible frill fragments and teeth. Indeterminate ceratopsid remains.
Chasmosaurinae Indeterminate Supraorbital horncores, an orbit, dorsal vertebra, indeterminate cranial fragments, limb bones, and unspecified postcranial elements pertaining to juvenile specimens. Indeterminate chasmosaurine remains belonging to juvenile specimens.
Coahuilaceratops C. magnacuerna A rostral, premaxilla, maxilla, nasals, supraorbital horncores, parietosquamosal fragment, predentary, and dentaries of an adult specimen and predentary, and dentary of a juvenile specimen, metacarpals, metatarsals, dorsal vertebrae, cervical vertebrae, caudal vertebrae, ulna and tibia. A chasmosaurine ceratopsid represented by an adult and juvenile specimen.

Ornithopods

Ornithopods of the Cerro del Pueblo Formation
Genus Species Material Notes Images
Hadrosauridae Indeterminate 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. Indeterminate hadrosaurid remains from numerous specimens.
Kritosaurus K. navajovius Predentary, symphyseal processes, rostral portion of dental battery of dentaries, rostral region of premaxillae, and fragments of maxilla. A kritosaurin hadrosaurid, referred to K. navajovius.
Lambeosaurinae Indeterminate 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. Indeterminate lambeosaurine remains from numerous specimens, including a large hadrosaurid.
Latirhinus L. uitstlani Caudal vertebrae, scapulae, humeri, ulnae, coracoid, metacarpals, manual ungual, ilia, ischia, femora, tibiae, fibula, and astragalus. Holotype specimen is chimeric as it consists of multiple individuals. Some material from the holotype specimen is assigned to Lambeosaurinae indet. and Saurolophinae indet..
Saurolophinae Indeterminate 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. Indeterminate saurolophine remains from numerous specimens, including juvenile individuals.
Tlatolophus T. galorum An almost complete skull, mandible, partial ilium, partial ischium, a femur, scapula, coracoid, sacral vertebrae, caudal vertebrae, and chevrons. A parasaurolophin hadrosaur, closely related to Charonosaurus and Blasisaurus.
Velafrons V. coahuilensis 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. A lambeosaurine hadrosaurid known only from a juvenile specimen.

Thescelosaurids

Thescelosaurids of the Cerro del Pueblo Formation
Genus Species Material Notes Images
Thescelosauridae Indeterminate A right premaxillary tooth and a posterior sacral vertebral centrum. Indeterminate thescelosaurid remains.

Saurischians

Remains of the following saurischians have been found in the formation:

Theropods

Theropods of the Cerro del Pueblo Formation
Genus Species Material Notes Images
Caenagnathidae 3 tibia fragments, distal, proximal and medial shaft elements respectively. An oviraptorosaur. Two different morphotypes are suggested, a small one, less than a meter in length. And a big morphotype, almost reaching two meters.
Dromaeosaurinae Indeterminate A pedal ungual and dentary teeth. Indeterminate dromaeosaurine remains.
Ornithomimidae Indeterminate Dorsal vertebrae, caudal vertebrae, femora, fibulae, tibiae, metatarsals, ungual manuals, ungual pedals, phalanxes, manual phalanxes, manual phalanges, pedal phalanges, pedal phalanxes, pubes and tarsals. Indeterminate ornithomimid remains.
Paraxenisaurus P. normalensis Caudal vertebrae, femur, peses, manual phalanxes, manual ungual, tarsals, metatarsals, metacarpals, pedal phalanx, pedal phalanges, and pedal unguals. Represents the first known deinocheirid from North America.
cf. Richardoestesia Indeterminate A tooth. A taxon only known from teeth.
Saurornitholestinae Indeterminate A pedal ungual, manual unguals and teeth. Indeterminate saurornitholestine remains.
Theropoda Indeterminate 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. Indeterminate theropod remains.
Troodontidae Indeterminate A pedal phalanx and a tooth. Indeterminate troodontid remains.
Tyrannosauridae Indeterminate A caudal vertebra, indeterminate vertebrae, tibia, fibula, fragments of ungual phalanges, phalanges, and teeth. Indeterminate tyrannosaurid remains.

Other Fossils

Pterosaurs

Pterosaurs of the Cerro del Pueblo Formation
Taxa Presence Description Images
Ichnogenus: Saltillo, Coahuila Specimens kept at the Dinosaur Tracks Museum, of the University of Colorado at Denver and the Secretaría de Educación Pública de Coahuila, Mexico

Turtles

Turtles of the Cerro del Pueblo Formation
Genus Species Material Notes Images
Euclastes E. coahuilaensis Sea turtle, reclassified as belonging to the new genus Mexichelys.
Mexichelys M. coahuilaensis New genus for Euclastes coahuilaensis, sea turtle
Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Other vertebrates

Fish
Fossil eggs
Mammals

See also