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Chorrillo Formation
Geologic formation in Patagonia, Argentina From Wikipedia, the free encyclopedia
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The Chorrillo Formation, also named as Chorillo Formation,[1] is a Maastrichtian (Late Cretaceous Epoch, 72.1–66 million years ago) geologic formation in southern Patagonia, Argentina. The formation is more than 50 metres (160 ft) thick and underlies the Calafate Formation and rests on top of the La Irene Formation.[2]
This article needs additional citations for verification. (May 2024) |
Quick Facts Type, Underlies ...
Chorrillo Formation | |
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Stratigraphic range: Maastrichtian | |
![]() Satellite image of the Chorrillo Formation site (in the middle on the right). In the bottom left is the Perito Moreno Glacier. | |
Type | Geological formation |
Underlies | Calafate Formation |
Overlies | La Irene Formation |
Thickness | >50 m (160 ft) |
Lithology | |
Primary | Claystone |
Location | |
Location | Patagonia |
Coordinates | 49.9°S 72.5°W / -49.9; -72.5 |
Approximate paleocoordinates | 51.8°S 62.2°W / -51.8; -62.2 |
Region | Santa Cruz Province |
Country | Argentina |
Extent | Southeast of Viedma Lake North of Argentino Lake Austral Basin |
Type section | |
Named by | Arbe & Hechem |
Year defined | 1984 |
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Fossils
Summarize
Perspective
Dinosaur remains are among the fossils that have been recovered from the formation.
Fossils recovered from the formation are:
Color key
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Notes Uncertain or tentative taxa are in small text; |
Dinosaurs
Ornithopods
More information Ornithopods of the Chorrillo Formation, Genus ...
Ornithopods of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Euiguanodontia Indet. | Indeterminate | Proximal end of a femur | ||||
Hadrosauridae Indet. | Indeterminate | Two incomplete caudal centra | ||||
Isasicursor[3] | I. santacrucensis | Multiple specimens including teeth, several vertebrae, humerus, thigh bones, shoulder blades, and limbs | An elasmarian ornithopod | ![]() |
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Sauropods
More information Sauropods of the Chorrillo Formation, Genus ...
Sauropods of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Nullotitan[3] | N. glaciaris | Estancia Alta Vista | A partial skeleton consisting of a third cervical vertebra, tail vertebrae, a neck rib, ribs, a left shoulder blade, the ends of a right thigh bone, a right shin, a right calf bone, and a right ankle bone | A colossosaurian titanosaur | ![]() | |
Titanosauria Indet. | Indeterminate | Seven isolated teeth |
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Theropods
More information Theropods of the Chorrillo Formation, Genus ...
Theropods of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Kookne[3] | K. yeutensis | An incomplete right coracoid lacking sternal end and proximal end damaged | An ornithuran bird | |||
Maip[4] | M. macrothorax | La Anita Farm | Axis, several dorsal and caudal vertebrae, cervical and dorsal ribs, gastralia, a left coracoid, fragmentary scapula, partial right pubis, and partial metatarsal | The largest megaraptorid theropod of South America and possibly the largest member of this group | ||
Megaraptoridae Indet. | Indeterminate | La Anita Farm | Isolated teeth | |||
Noasauridae Indet. | Indeterminate | Isolated right pedal phalanx IV-2? | ||||
Unenlagiidae Indet. | Indeterminate | An isolated dorsal vertebrae, pedal ungual of digit II and phalanx III-2 | ||||
Yatenavis[5] | Y. ieujensis | Estancia La Anita. | Distal right humerus | An enantiornithine bird |
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Thyreophorans
More information Thyreophorans of the Chorrillo Formation, Genus ...
Thyreophorans of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Parankylosauria Indet.[6] | Indeterminate | Five fragmentary caudal vertebrae, incomplete ribs, two incomplete humeri, and nine osteoderms[7] |
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Anurans
More information Amphibians of the Chorrillo Formation, Genus ...
Amphibians of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Anura Indet. | Indeterminate | Isolated tibiofibula | ||||
Calyptocephalella | C. gayi | Incomplete left maxilla, incomplete right maxilla, incomplete right ilium, proximal right radioulna, left proximal end of tibiofibula and proximal half of urostyle | ||||
Calyptocephalellidae Indet. | Indeterminate | A distal end of right humerus | ||||
Pipoidea Indet. | Indeterminate | Distal end of right humerus |
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Fishes
More information Fishes of the Chorrillo Formation, Genus ...
Fishes of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Lamniformes Indet. | Indeterminate | Isolated upper lateral tooth | ||||
Teleostei Indet. | Indeterminate | Three crushing tooth crowns | ||||
Vidalamiinae Indet. | Indeterminate | Isolated tooth | A amiid fish |
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Mammals
More information Mammals of the Chorrillo Formation, Genus ...
Mammals of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Magallanodon[8] | M. baikashkenke | Río de Las Chinas Valley and La Anita Farm | Tentative first upper molariform, anterior end of a left dentary bearing part of its gliriform incisor, and upper mesial incisor from the right side | A ferugliotheriid gondwanathere | ||
Mammalia Indet. | Indeterminate | Two isolated caudal vertebrae | ||||
Patagorhynchus[9] | P. pascuali | La Anita Farm | Lower right molar attached to a fragment of the dentary | A ornithorhynchid monotreme | ![]() | |
Patagomaia[10] | P. chainko | La Anita Farm | Partial left acetabulum and ischium | A large therian | ![]() |
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Reptiles
Mosasaurs
More information Mosasaurs of the Chorrillo Formation, Genus ...
Mosasaurs of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Mosasauridae | Indeterminate |
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Rhynchocephalian
More information Rhynchocephalians of the Chorrillo Formation, Genus ...
Rhynchocephalians of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Notosphenos[11] | N. finisterre | A sphenodontid rhynchocephalian |
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Snakes
Turtles
More information Turtles of the Chorrillo Formation, Genus ...
Turtles of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Chelidae Indet. | Indeterminate | |||||
Hydromedusinae Indet. | Indeterminate | Left peripheral 3 or 4, bridge peripheral, fragment indet; bridge peripheral, right hypoplastron, buttress, plastral fragment and ?plastral fragment | ||||
Meiolaniformes Indet. | Indeterminate | Distal end of a left humerus |
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Insects
More information Insects of the Chorrillo Formation, Genus ...
Insects of the Chorrillo Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Material | Notes | Images | |
Coelolepida Indet.[12] | Indeterminate | La Anita farm | MPM-Pal 21835-3:W34/1, MPM-Pal 21835-23:W55/0, MPM-Pal 21835-22:R52/2,MPM-Pal 21835-20:Z47/3. MPM-Pal 21835-22: G55/0; MPM-Pal 2183-21: E42/3 | A Glossatan Lepidopteran | ||
Diamesinae Indet.[12] | "Morphotype 3" | La Anita farm | MPM-Pal 21835-9:E34/4, MPM-Pal 21835-19: V34/4 | A Chironomidae Nematoceran. Similar to the living genus Paraheptagyia | ||
Ephemeroptera Indet.[12] | Indeterminate | La Anita farm | MPM-Pal 21835-9:W37/1 | A Mayfly | ||
Lepidoptera Indet.[12] | Indeterminate | La Anita farm | MPM-Pal 21835-10:X30/2, MPM-Pal 21835-7:S27/2 | |||
Orthocladiinae Indet.[12] | "Morphotype 1" | La Anita farm | MPM-Pal 21835-24: M31/0, MPM-Pal 21835-3: P46/4 | A Chironomidae Nematoceran | ||
"Morphotype 2" | La Anita farm | MPM-Pal 21835-25: V26/3 | ||||
"Morphotype 5" | La Anita farm | MPM-Pal 21835-9: Q58/3 | It resembles modern Cricotopus | ![]() | ||
Tanypodinae Indet.[12] | "Morphotype 4" | La Anita farm | MPM-Pal 21835-2:Y40/3 | A Chironomidae Nematoceran |
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Molluscs
Gastropods
More information Gastropods of the Chorrillo Formation, Genus ...
Gastropods of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Allopeas[13] | A. agnolini | A achatinid gastropod | ||||
Bocourtia[13] | B. leonardodavincii | A bulimulid gastropod | ||||
Lilloiconcha[13] | L. novasi | A charopid gastropod | ||||
Coelostemma[13] | C. patagonica | A holospirid gastropod | ||||
Holospira | H. sp. | |||||
Physa | P. sp. | |||||
Pleuroceridae Indet. | Indeterminate | |||||
Pomacea | P. sp. | |||||
Potamolithus[13] | P. fabiani | A tateid gastropod | ||||
Stenophysa | S. sp. |
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Plants
More information Plants of the Chorrillo Formation, Genus ...
Plants of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Podocarpoxylon | P. dusenii |
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Algaes
More information Algaes of the Chorrillo Formation, Genus ...
Algaes of the Chorrillo Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Material | Notes | Images | |
Sphaeroplea[14] | S. striatocristata |
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Pollen
More information Pollen of the Chorrillo Formation, Genus ...
Pollen of the Chorrillo Formation | ||||||
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Genus | Species | Locality | Material | Notes | Images | |
Acylomurus[14] | A. silviae | |||||
Baculatisporites | B. comaumensis | |||||
B. kachaikensis | ||||||
Ceratosporites | C. equalis | |||||
Clavatipollenites | C. sp. | |||||
Clavifera | C. triplex | |||||
Concavissimisporites | C. sp. | |||||
Cyatheacidites | C. annulatus | |||||
Cyathidites | C. australis | |||||
C. minor | ||||||
C. rafaeli | ||||||
Foveosporites | F. canalis | |||||
Gleicheniidites | G. senonicus | |||||
Laevigatosporites | L. ovatus | |||||
Leptolepidites | L. sp. | |||||
Lusatisporis[14] | L. choiols | |||||
Microcachryidites | M. antarcticus | |||||
Peninsulapollis | P. gilli | |||||
Phyllocladidites | P. mawsonii | |||||
Podocarpidites | cf. P. ellipticus | |||||
cf. P. herbstii | ||||||
P. sp. | ||||||
Retitriletes | R. austroclavatidites | |||||
Trichotomosulcites | T. subgranulatus | |||||
Trilites | T. fasolae | |||||
cf. T. tuberculiformis | ||||||
cf. T parvallatus | ||||||
Tricolpites | T. reticulatus | |||||
T. sp. | ||||||
Tuberculatosporites | T. parvus | |||||
Vitreisporites | V. signatus |
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References
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