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
 Orectolobiformes - Ginglymostomatidae
Ginglymostoma sp. Müller and Henle 1838 nurse shark
 Carchariniformes - Carcharhinidae
Carcharhinus altimus requiem shark
Carcharhinus velox requiem shark
Carcharhinus obscurus Le Sueur 1818 requiem shark
Carcharhinus leucas Valenciennes 1839 requiem shark
Mammalia
 Glires -
Rodentia indet. Savage 1951 rodent
"indeterminate myomorph rodent"
 Lagomorpha - Leporidae
Notolagus sp. Wilson 1938 rabbit
 Carnivora - Canidae
Cerdocyon ? avius Torres and Ferrusquia 1981 crab-eating fox