Bajo de la Carpa Formation

Coordinates: 38°48′S 68°48′W / 38.8°S 68.8°W / -38.8; -68.8
Source: Wikipedia, the free encyclopedia.
Bajo de la Carpa Formation
Ma
↓
Type
Approximate paleocoordinates
43°24′S 49°48′W / 43.4°S 49.8°W / -43.4; -49.8
RegionNeuquén & Río Negro Provinces
CountryArgentina
ExtentNeuquén Basin
Bajo de la Carpa Formation is located in Argentina
Bajo de la Carpa Formation

The Bajo de la Carpa Formation is a

geologic formation of the Neuquén Basin that crops out in northern Patagonia, in the provinces of Río Negro and Neuquén, Argentina. It is the oldest of two formations belonging to the Río Colorado Subgroup within the Neuquén Group. Formerly, that subgroup was treated as a formation, and the Bajo de la Carpa Formation was known as the Bajo de la Carpa Member.[1]

At its base, this formation conformably overlies the Plottier Formation of the older Río Neuquén Subgroup, and it is in turn overlain by the Anacleto Formation, the youngest and uppermost formation of the Neuquén Group.[2][3]

The Bajo de la Carpa Formation can reach 150 metres (490 ft) in thickness in some locations, and consists mainly of

fluvial origin, with thin layers of mudstone and siltstone in between. Geological features such as geodes, chemical nodules, impressions of raindrops, and paleosols (fossil soils) are commonly found in this formation as well.[1][3]

Fossil content

Comahuesuchus brachybuccalis
Notosuchus terrestris

Reptiles

Vertebrate fossils are abundant within the Bajo de la Carpa Formation:

Small

eggs inside, found in this formation, probably belonged to the bird Neuquenornis.[3] Fossil wasp nests have also been found in these rocks.[1][3]

Dinosaurs

Ornithischians

Ornithischians
reported from the Allen Formation
Genus Species Location Stratigraphic position Material Notes Images
Ankylosauria[8] Indetermidate.
Mahuidacursor[9] M. lipanglef An ornithopod.

Sauropods

Sauropods
reported from the Allen Formation
Genus Species Location Stratigraphic position Material Notes Images
Bonitasaura B. salgadoi A titanosaur.
Inawentu I. oslatus A titanosaur.
Overosaurus O. paradasorum A titanosaur.
Rinconsaurus R. caudamirus A titanosaur.
Traukutitan[10] T. eocaudata A titanosaur.

Theropods

Theropods
reported from the Allen Formation
Genus Species Location Stratigraphic position Material Notes Images
Achillesaurus A. manazzonei Upper A partial skeleton consists of a sacral vertebra, four tail vertebrae, part of the left thighbone, shin, and foot, and the left ilium. An
alvarezsaurid
.
Alvarezsaurus A. calvoi An alvarezsaurid.
Llukalkan [11] L. aliocranianus La Invernada site. A partial skull. An abelisaur.
Neuquenornis[3] N. volans Upper A skull and a partial postcranial remains. A
enantiornithine
bird.
Patagopteryx P. eferrariisi Upper The oldest known flightless bird.
Tratayenia[12] T. rosalesi A well-preserved partial skeleton A
theropod
.
Velocisaurus[11] V. unicus A
noasaur
.
Viavenator[11] V. exxoni An
abelisaur
.

See also

References

  1. ^ a b c Sánchez et al., 2006
  2. ^ Fossa Mancini et al., 1938
  3. ^ a b c d e Leanza et al., 2004
  4. ^ Martinelli et al., 2012
  5. ^ Lio et al., 2018
  6. ^ Filippi et al., 2018a
  7. ^ Coria et al., 2019
  8. ISSN 0195-6671
    .
  9. ^ Cruzado Caballero et al., 2019
  10. ISSN 0195-6671
    .
  11. ^ a b c Filippi et al., 2018b
  12. ^ Porfiri et al., 2018

Bibliography

Further reading
Retrieved from "https://en.wikipedia.org/w/index.php?title=Bajo_de_la_Carpa_Formation&oldid=1220132012"