RoS 51, El Rosario: Late/Upper Campanian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Globiodonta informal indet. B
1 specimen
spec. 17
Amphibia - Temnospondyli
Anura indet. (Fischer von Waldheim 1813)
18 specimens
specs. 1, 22, 23, 27, 41, 54, 56, 58A–F, 59, 62, 63D, 67, 94
Amphibia - Temnospondyli - Albanerpetontidae
cf. Albanerpeton sp. Estes and Hoffstetter 1976
2 specimens
spec. 57
    = Albanerpetontidae indet. Fox and Naylor 1982
Romo de Vivar Martínez et al. 2016
IGM 4859, 4860
Reptilia
Theropoda indet. (Marsh 1881)
1 specimen
spec. 7
Theropoda informal indet. A (Marsh 1881)
1 specimen
spec. 2
Theropoda informal indet. B (Marsh 1881)
1 specimen
spec. 3
Theropoda informal indet. C (Marsh 1881)
1 specimen
spec. 36
Maniraptora indet. Gauthier 1986
2 specimens
specs. 24, 25
Reptilia - Troodontidae
cf. Troodon formosus Leidy 1856
2 specimens
specs. 69, 71
    = Troodontidae indet. Gilmore 1924
Ramírez-Velasco and Hernández-Rivera 2015
Reptilia - Dromaeosauridae
Saurornitholestes sp. Sues 1978
1 specimen
spec. 72
    = Saurornitholestinae indet. Longrich and Currie 2009
Ramírez-Velasco and Hernández-Rivera 2015
Richardoestesia gilmorei Currie et al. 1990
1 specimen
spec. 34
    = cf. Richardoestesia sp. Currie et al. 1990
Ramírez-Velasco and Hernández-Rivera 2015
Richardoestesia isosceles Sankey 2001
3 specimens
specs. 75, 76, 83
    = cf. Richardoestesia sp. Currie et al. 1990
Ramírez-Velasco and Hernández-Rivera 2015
Reptilia
cf. Aves indet. (Linnaeus 1758)
1 specimen
spec. 11
Crocodylomorpha informal indet. F (Hay 1930)
1 specimen
spec. 35
Mesoeucrocodylia informal indet. C Whetstone and Whybrow 1983
1 specimen
spec. 70
Mesoeucrocodylia informal indet. D Whetstone and Whybrow 1983
1 specimen
spec. 15
Mesoeucrocodylia informal indet. E Whetstone and Whybrow 1983
1 specimen
spec. 51
cf. Leidyosuchus sp. Lambe 1907
7 specimens
specs. 9, 10, 12–14, 74, 80
Reptilia - Alligatoridae
Alligatoridae informal indet. A Gray 1844
8 specimens
specs. 39, 40, 50, 55, 85, 86, 101, 102
Reptilia
cf. Brachychampsa sp. Gilmore 1911
12 specimens
specs. 4, 5, 18, 19, 38, 42, 68, 73, 96–98, 103
? Brachychampsa sp. Gilmore 1911
13 specimens
specs. 16, 31, 45, 46, 79, 81, 87–92, 99, 100
Reptilia - Atoposauridae
cf. Atoposauridae indet. (Gervais 1871)
6 specimens
specs. 26, 32, 49, 60, 84, 95
Reptilia
Squamata indet. (Oppel 1811)
1 specimen
spec. 63A
Reptilia - Polyglyphanodontidae
Dicothodon bajaensis (Nydam 1999)
3 specimens
specs. 20, 21, 52
Reptilia - Xenosauridae
cf. Exostinus sp. Cope 1873
1 specimen
spec. 33
Reptilia
cf. Palaeosaniwa canadensis Gilmore 1928
2 specimens
specs. 8, 93
Varanoidea indet. Gray 1827
2 specimens
specs. 37, 77
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
López-Conde et al. 2018 1 specimen
IGM-11168 (Fig. 2D), a single fragment of shell
Reptilia
cf. Naomichelys sp. Hay 1908
74 specimens
specs. 6A–AAj
Actinopteri - Elopiformes - Phyllodontidae
Paralbulinae indet. Estes 1969
9 specimens
specs. 28A–I
Actinopteri - Lepisosteiformes - Lepisosteidae
Lepisosteidae indet. Cuvier 1825
1 specimen
spec. 30
Chondrichthyes - Rajiformes - Ptychotrygonidae
Ptychotrygon sp. Jaekel 1894
1 specimen
spec. 82
see common names

Geography
Country:Mexico State/province:Baja California
Coordinates: 30.1° North, 115.8° West (view map)
Paleocoordinates:35.5° North, 86.5° West
Basis of coordinate:stated in text
Altitude:78 meters
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
Key time interval:Late/Upper Campanian
Age range of interval:83.60000 - 72.10000 m.y. ago
Stratigraphy
Formation:El Gallo Member:El Disecado
Stratigraphic resolution:bed
Stratigraphy comments: fossils from layer 11
Lithology and environment
Primary lithology:fine,nodular,gray,green argillaceous sandstone
Includes fossils?Y
Lithology description: "La sección estratigráfica de la localidad ROS51 está compuesta por estratos de arenisca amarilla de grano medio a grueso con estratificación cruzada y/o horizontal, intercalados con areniscas grisáceas de grano fino y matriz de arcilla, y por limolitas arenosas grisáceas. El material fue hallado en un estrato conformado por arenisca arcillosa de grano fino."
Environment:fluvial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Disassociated major elements:some
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:general faunal/floral analysis
Collection method comments: IGM, Colección Nacional de Paleontología "María del Carmen Perrillat", Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad de México
Metadata
Also known as:ROS51
Database number:197021
Authorizer:E. Vlachos, M. Carrano Enterer:E. Vlachos, M. Carrano
Modifier:M. Carrano
Created:2018-10-19 13:40:58 Last modified:2022-09-20 13:05:30
Access level:the public Released:2018-10-19 13:40:58
Creative Commons license:CC BY
Reference information

Primary reference:
82635. P. R. Romo de Vivar Martínez. 2011. Microvertebrados Cretácicos Tardíos del Área de El Rosario, Baja California, México [Late Cretaceous microvertebrates from the El Rosario area, Baja California, Mexico]. 1-146 [M. Carrano/M. Carrano/M. Uhen]

Secondary references:

67117 O. A. López-Conde, J. Sterli, M. L. Chavarría-Arellano, D. B. Brinkman, and M. Montellano-Ballesteros. 2018. Turtles from the Late Cretaceous (Campanian) of El Gallo Formation, Baja California, Mexico. South American Journal of Earth Sciences 88:693-699 [E. Vlachos/E. Vlachos/P. Mannion]
82620 Á A. Ramírez-Velasco and R. Hernández-Rivera. 2015. Diversity of Late Cretaceous dinosaurs from Mexico. Boletín Geológico y Minero 126(1):63-108 [M. Carrano/M. Carrano]
73275 P. R. Romo de Vivar Martínez, M. Montellano Ballesteros, and D. García Alcántara. 2016. Primer registro de la Familia Albanerpetontidae (Lissamphibia) en la formación El Gallo (Campaniano, Cretácico Superior), Baja California, México [First record of the family Albanerpetontidae (Lissamphibia) in the El Gallo Formation (Campanian, Upper Cretaceous), Baja California, Mexico). Boletín de la Sociedad Geológica Mexicana 68(3):571-580 [M. Carrano/M. Carrano]