| Sarmiento Formation | |
|---|---|
| Stratigraphic range: Bartonian-Burdigalian (Casamayoran-Colhuehuapian) ~ | |
 | |
| Sub-units | Colhué Huapí Member, Gran Barranca Member, Puesto Almendra Member, Rosado Member, Trelew Member, and Vera Member |
| Underlies | Chenque Formation Gaiman Formation |
| Overlies | Koluel Kaike Formation (Río Chico Group) |
| Thickness | 319 metres |
| Lithology | |
| Primary | Sandstone, mudstone |
| Other | Limestone |
| Location | |
| Country |  Argentina |
| Extent | Golfo San Jorge Basin |
| Type section | |
| Named for | Sarmiento, Chubut |
| Region | Chubut Province |
| Country | Argentina |
| Thickness at type section | 319 metres (1,047 ft) (tuffs) |
 Location of the Sarmiento Formation within Argentina | |
The Sarmiento Formation (Spanish: Formación Sarmiento), in older literature described as the Casamayor Formation, is a geological formation in Chubut Province, Argentina, in central Patagonia, which spans around 30 million years from the mid-Eocene to the early Miocene. It predominantly consists of pyroclastic deposits,[1] which were deposited in a semi-arid environment.[2] It is divided up into a number of members.[1] The diverse fauna of the Sarmiento Formation, including a variety of birds, crocodilians, turtles and snakes, also includes many mammals such as South American native ungulates (notoungulates, litopterns, astrapotheres) as well as armadillos, and caviomorph rodents.[3]
- ^ a b H.), Madden, R. H. (Richard (2010). "Physical stratigraphy of the Sarmiento Formation (middle Eocene – lower Miocene) at Gran Barranca, central Patagonia". The paleontology of Gran Barranca : evolution and environmental change through the middle Cenozoic of Patagonia. Cambridge University Press. ISBN 978-0-521-87241-6. OCLC 499130096.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ Madden, Richard H. (2010). "Loessic and fluvial sedimentation in Sarmiento Formation pyroclastics, middle Cenozoic of central Patagonia". The paleontology of Gran Barranca : evolution and environmental change through the middle Cenozoic of Patagonia. Cambridge University Press. ISBN 978-0-521-87241-6. OCLC 499130096.
- ^ Dozo, María Teresa; Ciancio, Martín; Bouza, Pablo José; Martínez, Gastón (2014). "New association of Paleogene Mammals in Eastern of Patagonia (Chubut Province, Argentina): biochronological and paleobiogeographical implications". Andean Geology. 41 (1). doi:10.5027/andgeoV41n1-a09. hdl:11336/27088.
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