The Deseadan ( es, Deseadense) age is a period of
geologic time (29.0–21.0
Ma) within the
Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ...
epoch of the
Paleogene
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...
to the
Early Miocene
The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene Epoch made up of two stages: the Aquitanian and Burdigalian stages.
The sub-epoch lasted from 23.03 ± 0.05 Ma to 15.97 ± 0.05 Ma (million years ago). It was prece ...
epoch of the
Neogene
The Neogene ( ), informally Upper Tertiary or Late Tertiary, is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period Mya. ...
, used more specifically within the
SALMA classification of South America. It follows the
Tinguirirican The Tinguirirican ( es, Tinguiririquense) age is a period of geologic time (36.0–29.0 Ma) within the Late Eocene and Early Oligocene epochs of the Paleogene, used more specifically within the SALMA classification in South America. It follows the ...
and precedes the
Colhuehuapian The Colhuehuapian age is a period of geologic time (21.0–17.5 Ma) within the Early Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Deseadan and precedes the Santacrucian ag ...
age.
Paleo Database: Deseadan
/ref>
Etymology
The age is named after the Deseado Formation Deseado may refer to: Geographic names and features
* Deseado (crater), a crater on the planet Mars
* Deseado Department, a department in Santa Cruz Province, Argentina
* Deseado Massif, a geological formation in Santa Cruz Province, Argentina
* D ...
of the Deseado Massif
The Deseado Massif (Spanish: ''Macizo del Deseado'') is a massif in southern Patagonia located in the Argentine province of Santa Cruz. On surface the massif is made up of Middle to Late Jurassic-aged felsic volcanic rocks. Analysis of mantle xeno ...
in eastern Patagonia
Patagonia () refers to a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and gl ...
, Argentina
Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...
.
Formations
Fossils
Correlations
The Deseadan South American land mammal age (SALMA) is equivalent to the Arikareean
The Arikareean North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 30,600,000 to 20,800,000 years BP, a period of . It is usuall ...
in the North American land mammal age
The North American land mammal ages (NALMA) establishes a geologic timescale for North American fauna beginning during the Late Cretaceous and continuing through to the present. These periods are referred to as ages or intervals (or stages when ref ...
(NALMA) and the Harrisonian
The Harrisonian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 24,800,000 to 20,600,000 years BP, a period of . It is usual ...
in the 2000 version of the classification. It overlaps with the Hsandagolian The Hsandagolian age is a period of geologic time (33.9 – 23.03 Ma) within the Oligocene epoch of the Paleogene used more specifically with Asian Land Mammal Ages. It follows the Kekeamuan and precedes the Tabenbulakian age.
The Ulangochuian ...
of Asia and the MP 25 zone of Europe, the Waitakian and the Landon epoch of New Zealand.
References
Bibliography
;General
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;Deseado Formation
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;Abanico Formation
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;Agua de la Piedra Formation
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;Barzalosa Formation
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;Castillo Formation
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;Chambira Formation
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;Chilcatay Formation
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;Dos Bocas Formation
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;Fray Bentos Formation
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;Gaiman Formation
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;Lacayani fauna
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;Monte León Formation
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;Moquegua Formation
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;Mugrosa Formation
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;Petaca Formation
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;Río Baguales Formation
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;Salla Formation
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;Sarmiento Formation
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;Tremembé Formation
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{{SALMA
Oligocene geochronology
Oligocene South America
Paleogene Argentina