View source for Earth:Los Alamitos Formation

{{Infobox rockunit
| name           = Los Alamitos Formation
| image          =
| caption        =
| type           = [[Earth:Geological formation|Geological formation]]
| period         = Maastrichtian
| age            = [[Earth:Campanian|Late Campanian]]-[[Earth:Maastrichtian|Maastrichtian]]<br />~{{fossil range|85|66}}
| prilithology   = [[Earth:Siltstone|Siltstone]]
| otherlithology = [[Earth:Sandstone|Sandstone]]
| namedfor       =
| namedby        =
| region         = [[Place:Río Negro Province|Río Negro Province]]
| country        = Argentina
| coordinates    = {{coord|42.1|S|66.3|W|display=inline,title}}
| paleocoordinates = {{coord|45.0|S|52.3|W|display=inline}}
| unitof         =
| subunits       = [[Earth:Coli Toro Member|Coli Toro Member]]
| underlies      =
| overlies       =
| thickness      =
| extent         = North Patagonian Massif
| area           =
| map            = {{Location map+ | Argentina
| relief = 1
| width   = 250
| float   = center
| places  =
  {{Location map~ | Argentina
  | lat_deg = -42.1
  | lon_deg = -66.3
  | mark = Green pog.svg
  | marksize = 12
  }}
}}
| map_caption    =
}}
The '''Los Alamitos Formation''' is a geological formation of the North Patagonian Massif in Rio Negro Province, northwestern [[Place:Patagonia|Patagonia]], Argentina, whose strata date back to the [[Earth:Late Cretaceous|Late Cretaceous]] ([[Earth:Campanian|Late Campanian]] to [[Earth:Maastrichtian|Maastrichtian]]). Dinosaur remains are among the fossils that have been recovered from the formation.<ref name="cretaceousdistribution">Weishampel et al., 2004, "Dinosaur distribution (Late Cretaceous, South America).", pp.600-604</ref>

== Fossil content ==
[[File:Paleogeography Gondwana - Late Cretaceous-Early Paleogene - around 85-63 Ma.jpg|thumb|right|320px|Paleogeography of the Late Cretaceous with Los Alamitos Formation indicated]]

=== Dinosaurs ===
{| class="wikitable" align="center"
|-
! colspan="7" align="center" | '''Non-avian [[Biology:Dinosaur|dinosaur]]s reported from Los Alamitos Formation'''
|-
! Genus !! Species !! Material !! Notes !! Images
|-
| ''[[Biology:Aeolosaurus|Aeolosaurus]]''
| ''A. rionegrinus''
|
| 
| [[File:Aeolosaurus-rionegrinus-JD-2020-1.png|center|150px]]
|-
| ''[[Biology:Huallasaurus|Huallasaurus]]'' (=''[[Biology:Kritosaurus|"Kritosaurus" australis]]'')
| ''H. australis''
| "Partial skulls with associated postcrania, approximately [five] individuals."
| {{center|<ref name=rozadilla2022>{{cite journal | url=https://www.tandfonline.com/doi/full/10.1080/14772019.2021.2020917 | title=A new hadrosaurid (Dinosauria: Ornithischia) from the Late Cretaceous of northern Patagonia and the radiation of South American hadrosaurids | last1=Rozadilla | first1=Sebastián | last2=Brissón-Egli | first2=Federico | last3=Lisandro Agnolín | first3=Federico | last4=Aranciaga-Rolando | first4=Alexis Mauro | last5=Novas | first5=Fernando Emilio | journal=Journal of Systematic Palaeontology | year=2022 | volume=19 | issue=17 | pages=1207–1235 | doi=10.1080/14772019.2021.2020917| s2cid=247122005 }}</ref><ref name=AMGS10>{{cite journal |last=Prieto–Marquez |first=Alberto |author2=Salinas, Guillermo C.  |year=2010 |title=A re–evaluation of ''Secernosaurus koerneri'' and ''Kritosaurus australis'' (Dinosauria, Hadrosauridae) from the Late Cretaceous of Argentina |journal=Journal of Vertebrate Paleontology |volume=30 |issue=3 |pages=813–837 |doi=10.1080/02724631003763508|s2cid=85814033 }}</ref><ref name="table-20-1-441">"Table 20.1," in Weishampel, et al.</ref>}}
| [[File:Hadrosaur_museum.jpg|center|150px]]
|-
| Indeterminate theropod
| 
|
|
| 
|-
|}

=== Birds ===
{| class="wikitable" align="center"
|-
! colspan="7" align="center" | '''[[Biology:Bird|Bird]]s reported from the Los Alamitos Formation'''
|-
! Genus !! Species !! Material !! Notes !! Images
|-
| ''[[Biology:Alamitornis|Alamitornis]]''
| ''A. minutus''
|
|
| 
|-
| cf. [[Biology:Hesperornithes|Hesperornithes]]
|
|
|
|
|-
| Indeterminate Ornithurine
|
|
|
|
|-
| Indeterminate [[Biology:Bird|Avian]]
|
|
|
|
|-
|}

=== Rhynchocephalians ===
{| class="wikitable" align="center"
|-
! colspan="7" align="center" | '''[[Biology:Rhynchocephalia|Rhynchocephalia]]ns reported from the Los Alamitos Formation'''
|-
! Genus !! Species !! Material !! Notes !! Images
|-
| ''Alamitosphenos''
| ''A. mineri''
|
|{{center|<ref name=Agnolín2023>{{Cite journal|last1=Agnolín |first1=F. L. |last2=Aranciaga Rolando |first2=A. M. |last3=Chimento |first3=N. R. |last4=Novas |first4=F. E. |year=2023 |title=New small reptile remains from the Late Cretaceous of Patagonia increase morphological diversity of sphenodontids (Lepidosauria) |journal=Proceedings of the Geologists' Association |doi=10.1016/j.pgeola.2023.09.007 }}</ref>}}
|
|}

=== Mammaliaforms ===
{| class="wikitable" align="center"
|-
! colspan="7" align="center" | '''Mammaliaforms reported from the Los Alamitos Formation'''
|-
! Genus !! Species !! Material !! Notes !! Images
|-
| ''Alamitherium''
| ''A. bishopi''
| 
| {{center|<ref name=Bonaparte1999>Bonaparte, 1999</ref>}}
| 
|-
| ''[[Biology:Austrotriconodon|Austrotriconodon]]''
| ''A. sepulvedai''<br />''A. mckennai''
|
|
| rowspan=2 |
|-
| ''[[Biology:Leonardus|Leonardus]]''
| ''L. cuspidatus''
| 
| 
|-
| ''Bondesius''
| ''B. ferox''
| 
| 
| 
|-
| ''Brandonia''
| ''B. intermedia''
| 
| 
| 
|-
| ''Casamiquelia''
| ''C. rionegrina''
| 
| 
| 
|-
| ''[[Biology:Ferugliotherium|Ferugliotherium]]''
| ''F. windhauseni''
|
|
|
|-
| ''[[Biology:Gondwanatherium|Gondwanatherium]]''
| ''G. patagonicum''
| 
| 
| 
|-
| ''[[Biology:Groebertherium|Groebertherium]]''
| ''G. novasi''
| 
| 
| 
|-
| ''Mesungulatum''
| ''M. houssayi'' 
| 
| {{center|<ref name=Bonaparte1985>Bonaparte & Soria, 1985</ref>}}
| 
|-
| ''Paraungulatum''
| ''P. rectangularis''
| 
| 
| 
|-
| ''[[Biology:Reigitherium|Reigitherium]]''
| ''R. bunodontum'' 
| 
| {{center|<ref name=Bonaparte1990>Bonaparte, 1990</ref>}}
| 
|-
| ''Rougiertherium''
| ''R. tricuspes''
| 
| 
| 
|-
|}

== See also ==
* List of dinosaur-bearing rock formations

== References ==
{{Reflist|3}}

=== Bibliography ===
* {{cite LSA |last=Weishampel |first=David B. |last2=Dodson |first2=Peter |last3=Osmólska (eds.) |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}}

[[Category:Los Alamitos Formation| ]]
[[Category:Siltstone formations]]
[[Category:Sandstone formations]]
[[Category:Lacustrine deposits]]

{{Sourceattribution|Los Alamitos Formation}}