The Río Belgrano Formation is a
Barremian
The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma ( million years ago) and 121.4 ± 1.0 Ma). It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is pre ...
to
Aptian
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ag ...
geologic
formation
Formation may refer to:
Linguistics
* Back-formation, the process of creating a new lexeme by removing or affixes
* Word formation, the creation of a new word by adding affixes
Mathematics and science
* Cave formation or speleothem, a secondary ...
of the
Austral Basin in
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 ...
, southern
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, t ...
. Among others,
pterosaur
Pterosaurs (; from Greek ''pteron'' and ''sauros'', meaning "wing lizard") is an extinct clade of flying reptiles in the Order (biology), order, Pterosauria. They existed during most of the Mesozoic: from the Late Triassic to the end of the Cre ...
and
ichthyosaur
Ichthyosaurs (Ancient Greek for "fish lizard" – and ) are large extinct marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1842, altho ...
fossils have been recovered from the formation.
Fossil content
The following fossils have been recovered from the formation:
* ''
Hatchericeras patagonense''
* ''
Palaeastacus terraereginae''
* ''
Platypterygius hauthali
''Platypterygius'' is a historically paraphyletic genus of platypterygiine ichthyosaur from the Cretaceous period. It was historically used as a wastebasket taxon, and most species within ''Platypterygius'' likely are undiagnostic at the genus o ...
''
[Páramo, 2018, p.6]
* ''
Sanmartinoceras africanum''
* ''
Tonohamites aequicingulatus''
*
?Anhangueridae indet.
See also
*
List of pterosaur-bearing stratigraphic units
This is a list of stratigraphic units, where pterosaur fossils have been recovered from. Units listed are all either formation rank or higher (e.g. group).
See also
* Pterosaur
* List of fossil sites
References
Further reading
*
Ext ...
References
Bibliography
*
Further reading
* M. B. Aguirre Urreta. 1989. The Cretaceous decapod Crustacea of Argentina and the Antarctic Peninsula. Palaeontology 32(3):499-552
* M. B. Aguirre Urreta. 1986. Aptian ammonites from the Argentinian Austral Basin. The Subfamily Helicancylinae Hyatt, 1894. Annals of the South African Museum 96(7):271-314
* J. F. Bonaparte. 1978. El Mesozoico de America de Sur y sus Tetrapodos
he Mesozoic of South America and its tetrapods Opera Lilloana 26:1-596
{{DEFAULTSORT:Rio Belgrano Formation
Geologic formations of Argentina
Cretaceous Argentina
Aptian Stage
Barremian Stage
Sandstone formations
Shallow marine deposits
Formations
Fossiliferous stratigraphic units of South America
Paleontology in Argentina
Geology of Santa Cruz Province, Argentina