Río Loro Formation
Río Loro Formation Stratigraphic range: Late Paleocene (Riochican) ~ | |
---|---|
Type | Geological formation |
Underlies | |
Overlies | Los Blanquitos Formation |
Thickness | 95 m (312 ft) |
Lithology | |
Primary | Sandstone, siltstone |
Other | Conglomerate, paleosols |
Location | |
Coordinates | 26°36′S 65°12′W / 26.6°S 65.2°WCoordinates: 26°36′S 65°12′W / 26.6°S 65.2°W |
Approximate paleocoordinates | 29°18′S 53°48′W / 29.3°S 53.8°W |
Region | Tucumán Province |
Country | Argentina |
Extent | Sierras Pampeanas |
Type section | |
Named for | |
Named by | Bossi |
Year defined | 1969 |
Río Loro Formation (Argentina) |
The Río Loro Formation is a geological formation of the Sierras Pampeanas in Tucumán Province Argentina whose strata date back to the Late Paleocene of the Paleogene, or Riochican in the SALMA classification.
The formation has been deposited in a meandering fluvial environment and has a maximum noted thickness of 95 metres (312 ft).
The formation has provided fossils of several mammals and reptiles. The crocodylian genus Lorosuchus and mammal species were named after the formation which is correlated with the Mealla Formation of the Salta Basin to the northwest of Tucumán Province.
Description[]
The Río Loro Formation crops out in the , north of Tucumán city. The formation, first defined by Bossi in 1969,[1] reaches a thickness of 95 metres (312 ft),[2] and comprises red sandstones and siltstones deposited in a fluvial meandering environment.
The Río Loro Formation unconformably overlies the Cretaceous Los Blanquitos Formation and is overlain by the . The Río Loro Formation is correlated with the Mealla Formation of the Salta Basin to the northeast.[2]
Fossil content[]
The following fossils were reported from the formation:[3]
- Mammals
- Notoungulates
- Eutheria
- Xenungulata
- Placentalia
- Reptiles
- Turtles
- Crocodylians
See also[]
References[]
Bibliography[]
- Journal of Systematic Palaeontology _. 1. ; , and . 2020. Phylogenetic relationships and palaeobiology of a new xenungulate (Mammalia: Eutheria) from the Palaeogene of Argentina.
- Mamíferos paleógenos del subtrópico de Argentina: síntesis de estudios estratigráficos, cronológicos y taxonómicos, 730-753. XX Congreso Geológico Argentino. Accessed 2020-06-14. ISBN 978-987-42-6666-8 . 2017.
- Paleógeno y Neógeno de Tucumán: estratigrafía y paleoambientes sedimentarios, 106-123. Geología de Tucumán. Accessed 2020-06-14. . 2014.
- A new sebecid mesoeucrocodylian from the Rio Loro Formation (Palaeocene) of north-western Argentina. Zoological Journal of the Linnean Society 163. S7–S36. Accessed 2020-06-14. , and . 2011.
- , and . 1993. Les tortues fossiles d'Argentine: synthese - The fossil turtles of Argentina: synthesis. (Invertebrés-Vertebrés) 79. 169-232.
- Ameghiniana 26. 145-151. . 1989. El primer Notoungulata de la Formación Rio Loro (Paleoceno medio), Provincia de Tucumán, Republica Argentina.
- Ameghiniana 18. 155-168. , and . 1981. Un primitivo Astrapotheria (Mammalia) y la edad de la Formación Río Loro, provincia de Tucumán, República Argentina.
- Geologic formations of Argentina
- Paleocene Series of South America
- Paleogene Argentina
- Thanetian Stage
- Riochican
- Sandstone formations
- Siltstone formations
- Fluvial deposits
- Fossiliferous stratigraphic units of South America
- Paleontology in Argentina
- Geology of Tucumán Province