| Cerro del Pueblo Formation | |
| Type: | Geological formation |
| Age: | Campanian ~ |
| Period: | Campanian |
| Prilithology: | Mudstone, sandstone |
| Otherlithology: | Siltstone, conglomerate, limestone |
| Region: | Coahuila |
| Coordinates: | 26.1°N -101.1°W |
| Paleocoordinates: | 32.2°N -75.5°W |
| Unitof: | Difunta Group |
| Underlies: | Cerro Huerta Formation |
| Overlies: | Parras Shale |
| Thickness: | 160m (530feet) |
| Extent: | Parras Basin |
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.[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]
Remains of the following ornithischians have been found in the formation:
| 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 of the Cerro del Pueblo Formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Images |
| Centrosaurinae[3] | 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. | |
| 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[4] | 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[5] | 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..[6] | |
| 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[7] | 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[8] | 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. | |
Remains of the following saurischians have been found in the formation:
| Theropods of the Cerro del Pueblo Formation | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Images |
| Caenagnathidae | 3 tibia fragments, distal, proximal and medial shaft elements respectively.[10] | 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[11] | 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. | |