Rancho Algodones (Pliocene of Mexico)

Also known as IGM 92

Where: Baja California Sur, Mexico (23.2° N, 109.6° W: paleocoordinates 23.0° N, 108.3° W)

• coordinate stated in text

When: Refugio Formation, Pliocene (5.3 - 2.6 Ma)

• From the text: Based on the elasmobranchs, the age of Rancho Algodones is Pliocene, not being able to distinguish which part of the Pliocene. Formerly Salada Formation.

• formation-level stratigraphic resolution

Environment/lithology: marine; calcareous sandstone

• Shallow marine deposits, with a probable depth of 30 meters
• Arenisca arcosica de grano medio a grueso, cementada por carbonato de calcio, de color amarillo claro y de estratificación mediana a gruesa; conglomerado de grano fino, limolita y lutita de estratificación lenti cular o convulsiva

Size class: macrofossils

Primary reference: L. Espinosa-Arrubarrena and S. P. Applegate. 1981. Selacifauna Pliocenica de Baja California Sur, Mexico y sus problemas de correlacion regional. Anais do Congresso Latino-Americano Paleontologia 2(2):667-681 [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 154118: authorized by Mark Uhen, entered by Mark Uhen on 27.01.2014, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Rancho Algodones Local Fauna
Chondrichthyes
 Squaliformes - Dalatiidae
Dalatiidae indet. Gray 1851 elasmobranch
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1843 megalodon
 Lamniformes - Lamnidae
Isurus oxyrinchus Rafinesque 1810 mako shark
Carcharodon carcharias Linnaeus 1758 great white shark
Carcharodon sulcidens Agassiz 1843 white shark
 Carchariniformes - Carcharhinidae
Galeocerdo rosaliensis Applegate 1978 tiger shark
Carcharhinus altimus requiem shark
Carcharhinus velox requiem shark
Carcharhinus albimarginatus Rüppell 1837 requiem shark
Carcharhinus brachyurus Gunther 1870 requiem shark
Carcharhinus obscurus Le Sueur 1818 requiem shark
Carcharhinus leucas Valenciennes 1839 requiem shark
 Orectolobiformes - Ginglymostomatidae
Ginglymostoma sp. Müller and Henle 1838 nurse shark
Mammalia
 Glires -
Rodentia indet. rodent
"indeterminate myomorph rodent"
 Lagomorpha - Leporidae
Notolagus sp. Wilson 1937 rabbit
 Carnivora - Canidae
Cerdocyon ? avius Torres and Ferrusquia 1981 crab-eating fox