{{Short description|Late Cretaceous geologic formation of Argentina}} {{Infobox rockunit | name = Angostura Colorada Formation | image = | caption = | type = Geological formation | period = Maastrichtian | age = Campanian-Maastrichtian | prilithology = Sandstone, claystone, conglomerate | otherlithology = | namedfor = | namedby = Volkhaimer | year_ts = 1973 | region = Río Negro Province | country = Argentina | coordinates = {{coord|41.3|S|68.7|W|display=inline,title}} | paleocoordinates = {{coord|43.9|S|54.7|W|display=inline}} | unitof = | subunits = | underlies = Coli Toro Formation, Huitrera & Collón Cura Formations | overlies = Sañicó Formation | thickness = | extent = Neuquén Basin, North Patagonian Massif | area = | map = {{Location map+ | Argentina | relief = 1 | width = 250 | float = center | places = {{Location map~ | Argentina | lat_deg = -41.3 | lon_deg = -68.7 | mark = Lightgreen pog.svg | marksize = 12 }} }} | map_caption = }}
The '''Angostura Colorada Formation''' is a Campanian to Maastrichtian geologic formation of the Neuquén Basin and North Patagonian Massif in the Río Negro Province of Argentina. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.<ref name="dinosaurdistribution">Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.</ref>
== Description == The Angostura Colorada Formation was defined by Volkhaimer in 1973 and unconformably overlies the Late Triassic volcanics of the Sañicó Formation. The formation is partly overlain by the Huitrera and Collón Cura Formations,<ref name=Prez2013_p223>Prez & Massaferro, 2013, p.223</ref> and in other parts by the Coli Toro Formation.<ref name=Ottone2009_p377>Ottone, 2009, p.377</ref> The formation, outcropping south of Comallo, comprises sandstones, claystones and conglomerates deposited in a fluvial environment.<ref name=Prez2013_p225>Prez & Massaferro, 2013, p.225</ref>
== Fossil content ==
{{paleobiota-key-compact}}
=== Dinosaurs ===
==== Ornithischians ==== {| class="wikitable" align="center" |- ! colspan="7" align="center" | Ornithischians of the Angostura Colorada Formation |- !Genus !Species !Location !Stratigraphic position !Material !Notes !Image |- | Hadrosauridae Indet. | Indeterminate | | | | | |- | Parankylosauria Indet.<ref>{{Cite web |last=Becerra |first=Marcos G. |last2=Juárez Valieri |first2=R.D |last3=Meso |first3=J.G |last4=Guzmán |first4=F.A |last5=Heredia |first5=J. |date=2024 |title=New remains of ankylosaurs in Río Negro (Argentina) found while revisiting collections in museums expand their presence to new late Cretaceous localities. |url=https://bicyt.conicet.gov.ar/fichas/produccion/11857603 |access-date=October 7, 2025 |website=Conicet}}</ref> | Indeterminate | | | | | |- |}
==== Sauropods ==== {| class="wikitable" align="center" |- ! colspan="7" align="center" | Sauropods of the Angostura Colorada Formation |- ! Genus ! Species ! Location ! Stratigraphic position ! Material ! Notes ! Images |- | ''Aeolosaurus''<ref name="dinosaurdistribution"/> | ''A. rionegrinus'' | | | | A aeolosaurin lithostrotian | |- | Lithostrotia Indet.<ref name="dinosaurdistribution"/> | Indeterminate | | | | | |- | Saltasaurinae Indet.<ref name="Ibirania">{{Cite journal |last1=Navarro |first1=Bruno A. |last2=Ghilardi |first2=Aline M. |last3=Aureliano |first3=Tito |last4=Díaz |first4=Verónica Díez |last5=Bandeira |first5=Kamila L. N. |last6=Cattaruzzi |first6=André G. S. |last7=Iori |first7=Fabiano V. |last8=Martine |first8=Ariel M. |last9=Carvalho |first9=Alberto B. |last10=Anelli |first10=Luiz E. |last11=Fernandes |first11=Marcelo A. |last12=Zaher |first12=Hussam |date=2022-09-15 |title=A new nanoid titanosaur (Dinosauria: Sauropoda) from the Upper Cretaceous of Brazil |url=https://www.researchgate.net/publication/362978138 |journal=Ameghiniana |language=en |volume=59 |issue=5 |pages=317–354 |doi=10.5710/AMGH.25.08.2022.3477 |s2cid=251875979 |issn=1851-8044}}</ref> | Indeterminate | | | | | |- |}
==== Theropods ==== {| class="wikitable" align="center" |- ! colspan="7" align="center" | Theropods of the Angostura Colorada Formation |- ! Genus ! Species ! Location ! Stratigraphic position ! Material ! Notes ! Images |- | Abelisauridae Indet.<ref>{{Cite journal |last1=Paulina-Carabajal |first1=A. |last2=Méndez |first2=A. H. |last3=Ulloa-Guaiquin |first3=K. |last4=González-Dionis |first4=J. |last5=Irazoqui |first5=F. M. |title=The first record of theropod dinosaur remains from the Angostura Colorada and Coli Toro formations (Campanian-Maastrichtian) in the Ingeniero Jacobacci area (Rio Negro Province, Argentina) |year=2025 |journal=Ameghiniana |url=https://www.ameghiniana.org.ar/index.php/ameghiniana/libraryFiles/downloadPublic/146 }}</ref> | Indeterminate | | | | | |- |}
== See also == * List of dinosaur-bearing rock formations ** List of stratigraphic units with few dinosaur genera
== References == {{Reflist}}
=== Bibliography === * {{citation |last=Ottone |first=Eduardo G |year=2009 |title=La flora cretácica de Cuenca Neuquina, su significado paleoambiental y paleoclimático |url=http://www.scielo.org.ar/pdf/raga/v65n2/v65n2a11.pdf |journal=Revista de la Asociación Geológica Argentina |volume=65 |pages=373–386 |accessdate=2018-09-08}} * {{citation |last1=Prez |first1=Horacio |last2=Massaferro |first2=Gabriela |year=2013 |title=Geología y geomorfología del tramo superior del Arroyo Comallo, Río Negro |url=http://gaea.org.ar/contribuciones/Contribuciones2014/Prez.pdf |journal=Contribuciones Científicas GÆA |volume=26 |pages=221–234 |accessdate=2018-09-08}} * {{citation |last1=Weishampel |first1=David B. |author2-link=Peter Dodson |last2=Dodson |first2=Peter |author3-link=Halszka Osmólska |last3=Osmólska |first3=Halszka |year=2004 |title=The Dinosauria, 2nd edition |url=https://books.google.com/books?id=vtZFDb_iw40C |publisher=Berkeley: University of California Press |pages=1–880 |accessdate=2019-02-21 |isbn=0-520-24209-2 |author1-link=David B. Weishampel }} * {{Cite journal |last=Cruzado-Caballero|first=P.|year=2017 |title=New hadrosaurid remains from the Late Cretaceous of Río Negro Province (Argentina, Late Cretaceous)|url=https://link.springer.com/article/10.1007/s41513-017-0023-5|journal=Journal of Iberian Geology|volume=43 |issue=2 |pages=307–318 |doi=10.1007/s41513-017-0023-5 |bibcode=2017JIbG...43..307C |accessdate=2021-04-07|hdl=11336/73174|hdl-access=free}} * {{Cite journal |last1=Zurriaguz|first1=Virginia|last2=Martinelli|first2=Agustín|last3=Rougier|first3=Guillermo W. |last4=Ezcurra|first4=Martín D.|last5=Manabe|first5=Makoto|last6=Tsuihiji|first6=Takanobu|last7=Novas|first7=Fernando E.|year=2017 |title=A saltasaurine titanosaur (Sauropoda: Titanosauriformes) from the Angostura Colorada Formation (upper Campanian, Cretaceous) of northwestern Patagonia, Argentina|url=https://www.sciencedirect.com/science/article/abs/pii/S0195667122003160|journal=Cretaceous Research|volume=75|pages=101–114|doi=10.1016/j.cretres.2017.03.016|bibcode=2017CrRes..75..101Z |accessdate=2023-01-29|hdl=11336/65494|hdl-access=free}}
== Further reading == * J. E. Powell. 1987. The Late Cretaceous fauna of Los Alamitos, Patagonia, Argentina part VI—the titanosaurids. Revista del Museo Argentina de Ciencias Naturales "Bernardino Rivadavia" e Instituto Nacional de Investigacion de las Ciencias Naturales: Paleontología 3(3):147-153
Category:Geologic formations of Argentina Category:Upper Cretaceous Series of South America Category:Cretaceous Argentina Category:Campanian Stage Category:Maastrichtian Stage of South America Category:Sandstone formations Category:Shale formations Category:Conglomerate formations of Argentina Category:Fluvial deposits Formations Category:Geology of Río Negro Province