The Deseadan () age is a period of
geologic time
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronolo ...
(29.0–21.0
Ma) within the
Oligocene
The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that defin ...
epoch of the
Paleogene
The Paleogene Period ( ; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period Ma (million years ago) to the beginning of the Neogene Period Ma. It is the fir ...
to the
Early Miocene
The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages: the Aquitanian age, Aquitanian and Burdigalian stages.
The sub-epoch lasted from 23.03 ± 0.05 annum, Ma to ...
epoch of the
Neogene
The Neogene ( ,) 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 million years ago. It is the second period of th ...
, used more specifically within the
SALMA classification of South America. It follows the
Tinguirirican
The Tinguirirican () age is a period of geologic time (36.0–29.0 Mya (unit), Ma) within the Eocene, Late Eocene and Oligocene, Early Oligocene epochs of the Paleogene, used more specifically within the South American land mammal age, SALMA classi ...
and precedes the
Colhuehuapian age.
Paleo Database: Deseadan
/ref>
Etymology
The age is named after the Deseado Formation of the Deseado Massif in eastern Patagonia
Patagonia () is a geographical region that includes parts of Argentina and Chile at the southern end of South America. The region includes the southern section of the Andes mountain chain with lakes, fjords, temperate rainforests, and glaciers ...
, Argentina
Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...
.
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 (NALMA) and the Harrisonian in the 2000 version of the classification. It overlaps with the Hsandagolian 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