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The Chorrillo Formation, also named as Chorillo Formation,Río Leona
at Fossilworks.org is a
The Chorrillo Formation, also named as Chorillo Formation,at Fossilworks.org is a
Maastrichtian
The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval ...
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 secondar ...
in southern 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 g ...
, 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, th ...
. The formation is more than thick and underlies the Calafate Formation and rests on top of the La Irene Formation.Marenssi et al., 2003, p.406
Fossils
Dinosaur remains are among the fossils that have been recovered from the formation. Fossils recovered from the formation are: *;Dinosaurs ** '' Isasicursor'' ** '' Nullotitan'' ** ''Maip
''Maip'' is a genus of large Megaraptora, megaraptorid Theropoda, theropod dinosaur from the Late Cretaceous (Maastrichtian) Chorrillo Formation of Santa Cruz Province, Argentina, Santa Cruz, Argentina. The genus contains a single species, ''M. ma ...
''
** '' Kookne''
** '' Yatenavis''
** Ankylosauria
Ankylosauria is a group of herbivorous dinosaurs of the order Ornithischia. It includes the great majority of dinosaurs with armor in the form of bony osteoderms, similar to turtles. Ankylosaurs were bulky quadrupeds, with short, powerful limbs. ...
indet.
** Euiguanodontia indet.
** Hadrosauridae indet.
** Megaraptoridae indet.
** Noasauridae
Noasauridae is an extinct family of theropod dinosaurs belonging to the group Ceratosauria. They were closely related to the short-armed abelisaurids, although most noasaurids had much more traditional body types generally similar to other th ...
indet.
** Unenlagiidae
Unenlagiidae is a proposed family of eumaniraptoran paravians that includes the subfamilies Unenlagiinae and possibly Halszkaraptorinae. Fossils of both subfamilies have been found in both Gondwanan and Laurasian deposits. The biology of the g ...
indet.
*;Anurans
** Anura indet.
** Calyptocephalellidae
The Calyptocephalellidae are a family of toads (although not true members of the Bufonidae) found in Chile containing two living genera, ''Calyptocephalella'' and '' Telmatobufo.''
The genus ''Calyptocephalella'' contains one living species, th ...
indet
*;Fishes
** Teleostei
Teleostei (; Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which are known as teleosts ), is, by far, the largest infraclass in the class Actinopterygii, the ray-finned fishes, containing 96% of all extant species of fish. Te ...
indet.
** Vidalamiinae
The Amiidae are a family of basal ray-finned fishes. The bowfin is the only species to survive today, although additional species in all four subfamilies of Amiidae are known from Jurassic, Cretaceous, and Eocene fossils.
Bowfins are now found ...
indet.
*;Mammals
** '' Magallanodon''
** Mammalia
Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur o ...
indet.
*;Mosasaurs
** Mosasauridae indet.
*;Snakes
** '' Rionegrophis''
** Serpentes
Snakes are elongated, limbless, carnivorous reptiles of the suborder Serpentes . Like all other squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales. Many species of snakes have skulls with several more joints ...
indet.
*;Turtles
** Chelidae indet.
Other fossils recovered from the formation are:
;Gastropods
* ''Pomacea
''Pomacea'' is a genus of freshwater snails with gills and an operculum, aquatic gastropod mollusks in the family Ampullariidae, the apple snails. The genus is native to the Americas; most species in this genus are restricted to South America ...
'' sp.
*Pleuroceridae
Pleuroceridae, common name pleurocerids, is a family of small to medium-sized freshwater snails, aquatic gilled gastropod mollusks in the superfamily Cerithioidea.These snails have an operculum and typically a robust high-spired shell.
Reprodu ...
indet.
* '' Potamolithus'' sp.
* '' Physa'' sp.
* '' Stenophysa'' sp.
*Achatinidae
Achatinidae (New Latin, from Greek "''agate''") is a family of medium to large sized tropical land snails, terrestrial pulmonate gastropod mollusks from Africa.
Well known species include ''Achatina achatina'' the Giant African Snail, and ''Liss ...
indet.
* '' Holospira'' sp.
*Bulimulidae
Bulimulidae is a taxonomic family of medium-sized to large, air-breathing, tropical and sub-tropical land snails, terrestrial pulmonate gastropod molluscs in the superfamily Orthalicoidea.MolluscaBase eds. (2020). MolluscaBase. Bulimulidae Tr ...
indet.
*;Plants
** '' Podocarpoxylon dusenii''
*;Pollen
** '' Baculatisporites comaumensis''
** '' Baculatisporites kachaikensis''
** '' Ceratosporites equalis''
** '' Clavifera triplex''
** '' Clavatipollenites sp.''
** '' Concavissimisporites sp.''
** '' Cyatheacidites annulatus''
** '' Cyathidites australis''
** '' Cyathidites minor''
** '' Cyathidites rafaeli''
** '' Foveosporites canalis''
** '' Gleicheniidites senonicus''
** '' Laevigatosporites ovatus''
** '' Leptolepidites sp. cf. L. major''
** '' Microcachryidites antarcticus''
** '' Peninsulapollis gilli''
** '' Phyllocladidites mawsonii''
** '' Podocarpidites sp. cf. P. ellipticus''
** '' Podocarpidites sp. cf. P. herbstii''
** '' Podocarpidites sp.''
** '' Retitriletes austroclavatidites''
** '' Trichotomosulcites subgranulatus''
** '' Tricolpites reticulatus''
** '' Tricolpites sp.''
** '' Trilites fasolae''
** '' Trilites sp. cf. T. tuberculiformis''
** '' Trilites sp. cf. T parvallatus''
** '' Tuberculatosporites parvus''
** '' Vitreisporites signatus''
See also
*List of dinosaur-bearing rock formations
This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented.
Containing body fossils
* List of stratigraphic units with dinosaur body fossils
** List of stratigraphic units with ...
References
Bibliography
* * * * *{{Cite journal , last1=Rozadilla, first1=S., last2=Novas, first2=F., last3=Agnolin, first3=F., last4=Manabe, first4=M., last5=Tsuihiji, first5=T. , year=2021, title=Ornithischian remains from the Chorrillo Formation (Upper Cretaceous), southern Patagonia, Argentina, and their implications on ornithischian paleobiogeography in the Southern Hemisphere, url=https://www.sciencedirect.com/science/article/abs/pii/S0195667121001282, journal=Cretaceous Research, volume=125, doi=10.1016/j.cretres.2021.104881, accessdate=2022-02-06Further reading
* J. E. Powell. 2003. Revision of South American titanosaurid dinosaurs: palaeobiological, palaeobiogeographical and phylogenetic aspects. Records of the Queen Victoria Museum Launceston 111:1-173 Geologic formations of Argentina Cretaceous Argentina Maastrichtian Stage of South America Shale formations Formations Fossiliferous stratigraphic units of South America Paleontology in Argentina Geography of Santa Cruz Province, Argentina Geology of Patagonia