Raigón Formation
The Raigón Formation is a geologic formation in Uruguay dated between the Pliocene and Middle Pleistocene.
Overview
In 1966, Uruguayan geologists Héctor Goso and Jorge Bossi defined the Raigón Formation, which they subdivided into the San José Member below and the San Bautista Member above. In 1988, Álvaro Mones identified Lower Pleistocene levels in the San José Member. In 2002, American geologist H. McDonald and Uruguayan paleontologist Daniel Perea suggested the formation may represent a wide timespan from the Montehermosan all the way to the Ensenadan.A notable finding was J. monesi, recovered in situ from a boulder originating in the San José Member. The boulder is made up of siltstone, claystone, and medium-grained and medium-to-conglomeratic psammite intercalated with siltstone.
Fossil content
The following fossils have been reported from the formation:CharruatoxodonDesmodus draculaeTrigodon sp.Catonyx tarijensis Pronothrotherium figueirasiGlyptodonPlaxhaplous GiganhingaJosephoartigasia monesiPronothrotheriumUruguayurusCardiatherium taliceiUruguayodonPlatygonus sp.- Phorusrhacinae
- Homotherini - previously assigned to cf. Xenosmilus sp., but its generic attribution is uncertain.