Sarmiento Formation

Sarmiento Formation
Stratigraphic range: Bartonian-Burdigalian
(Casamayoran-Colhuehuapian)
~50–17.5 Ma
Sub-unitsColhué Huapí Member, Gran Barranca Member, Puesto Almendra Member, Rosado Member, Trelew Member, and Vera Member
UnderliesChenque Formation
 Gaiman Formation
OverliesKoluel Kaike Formation
(Río Chico Group)
Thickness319 metres
Lithology
PrimarySandstone, mudstone
OtherLimestone
Location
Country Argentina
ExtentGolfo San Jorge Basin
Type section
Named forSarmiento, Chubut
RegionChubut Province
CountryArgentina
Thickness at type section319 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]

  1. ^ 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)
  2. ^ 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.
  3. ^ 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. Material was copied from this source, which is available under a Creative Commons Attribution 3.0 International License