RoS 51, El Rosario (Cretaceous of Mexico)

Also known as ROS51

Where: Baja California, Mexico (30.1° N, 115.8° W: paleocoordinates 35.5° N, 86.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: El Disecado Member (El Gallo Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• fossils from layer 11

• bed-level stratigraphic resolution

Environment/lithology: fluvial; fine-grained, nodular, gray, green, argillaceous sandstone

• "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."

Size classes: macrofossils, mesofossils

Collection methods: IGM, Colección Nacional de Paleontología "María del Carmen Perrillat", Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad de México

Primary reference: 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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 197021: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 19.10.2018, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Globiodonta "indet. B"
Chondrichthyes
 Rajiformes - Ptychotrygonidae
Ptychotrygon sp.
Ptychotrygon sp. Jaekel 1894 ray
spec. 82
Actinopteri
 Elopiformes - Phyllodontidae
Paralbulinae indet.
Paralbulinae indet. Estes 1969
specs. 28A–I
 Lepisosteiformes - Lepisosteidae
Lepisosteidae indet.
Lepisosteidae indet. Cuvier 1825 gar
spec. 30
Reptilia
 Testudinata - Helochelydridae
cf. Naomichelys sp.
cf. Naomichelys sp. Hay 1908 turtle
specs. 6A–AAj
 Testudines - Trionychidae
Trionychidae indet.1
Trionychidae indet.1 Gray 1825 softshell turtle
IGM-11168 (Fig. 2D), a single fragment of shell
 Loricata -
Crocodylomorpha "indet. F", Mesoeucrocodylia "indet. C", Mesoeucrocodylia "indet. D", Mesoeucrocodylia "indet. E"
Crocodylomorpha "indet. F" Hay 1930 crocodilian
spec. 35
Mesoeucrocodylia "indet. C" Whetstone and Whybrow 1983 crocodilian
spec. 70
Mesoeucrocodylia "indet. D" Whetstone and Whybrow 1983 crocodilian
spec. 15
Mesoeucrocodylia "indet. E" Whetstone and Whybrow 1983 crocodilian
spec. 51
 Loricata - Atoposauridae
cf. Atoposauridae indet.
cf. Atoposauridae indet. crocodilian
specs. 26, 32, 49, 60, 84, 95
 Crocodylia - Alligatoridae
Alligatoridae "indet. A", cf. Brachychampsa sp., ? Brachychampsa sp.
Alligatoridae "indet. A" crocodilian
specs. 39, 40, 50, 55, 85, 86, 101, 102
cf. Brachychampsa sp. Gilmore 1911 crocodilian
specs. 4, 5, 18, 19, 38, 42, 68, 73, 96–98, 103
? Brachychampsa sp. Gilmore 1911 crocodilian
specs. 16, 31, 45, 46, 79, 81, 87–92, 99, 100
 Crocodylia -
cf. Leidyosuchus sp.
cf. Leidyosuchus sp. Lambe 1907 crocodilian
specs. 9, 10, 12–14, 74, 80
 Theropoda -
Theropoda indet., Theropoda "indet. A", Theropoda "indet. B", Theropoda "indet. C", Maniraptora indet.
Theropoda indet. theropod
spec. 7
Theropoda "indet. A" theropod
spec. 2
Theropoda "indet. B" theropod
spec. 3
Theropoda "indet. C" theropod
spec. 36
Maniraptora indet. Gauthier 1986 maniraptoran
specs. 24, 25
Aves
 Aves -
cf. Aves indet.
cf. Aves indet. bird
spec. 11
Reptilia
 Theropoda - Dromaeosauridae
cf. Richardoestesia sp.2, cf. Richardoestesia sp.2, Saurornitholestinae indet.2
cf. Richardoestesia sp.2 Currie et al. 1990 maniraptoran
spec. 34
cf. Richardoestesia sp.2 Currie et al. 1990 maniraptoran
specs. 75, 76, 83
Saurornitholestinae indet.2 Longrich and Currie 2009 maniraptoran
spec. 72
 Theropoda - Troodontidae
Troodontidae indet.2
Troodontidae indet.2 Gilmore 1924 maniraptoran
specs. 69, 71
 Squamata -
Squamata indet.
Squamata indet. Oppel 1811 squamates
spec. 63A
 Squamata - Polyglyphanodontidae
Dicothodon bajaensis
Dicothodon bajaensis Nydam 1999 squamates
specs. 20, 21, 52
 Squamata -
Varanoidea indet.
Varanoidea indet. Gray 1827 squamates
specs. 37, 77
 Squamata - Xenosauridae
cf. Exostinus sp.
cf. Exostinus sp. Cope 1873 squamates
spec. 33
 Squamata -
cf. Palaeosaniwa canadensis
cf. Palaeosaniwa canadensis Gilmore 1928 squamates
specs. 8, 93
Amphibia
 Temnospondyli - Albanerpetontidae
Albanerpetontidae indet.3
Albanerpetontidae indet.3 Fox and Naylor 1982 tetrapod
spec. 57
 Salientia -
Anura indet.
Anura indet. Fischer von Waldheim 1813 frog
specs. 1, 22, 23, 27, 41, 54, 56, 58A–F, 59, 62, 63D, 67, 94
1López-Conde et al. 2018; 2Ramírez-Velasco and Hernández-Rivera 2015; 3Romo de Vivar Martínez et al. 2016