Английская Википедия:Allen Formation
Шаблон:Short description Шаблон:Infobox rockunit
The Allen Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous (middle Campanian to early Maastrichtian.[1] Dinosaur remains are among the fossils that have been recovered from the formation.[2] Indeterminate chelid remains and other vertebrates have also been discovered in this formation.[3]
Description
The stratotype of the formation was defined by Uliana and Dellapé in 1981 in the eastern area of the Bajo de Añelo, where the relation between base and top is clearly exposed. The deposits are mostly clastic, interbedded with banks of limestone and layers of anhydrite, which were defined continental and shallow marine facies associated with semiarid conditions.[4]
The interpreted sedimentary paleoenvironments range from purely continental such as ephemeral lacustrine, aeolian and fluvial systems to coastal marine paleoenvironments with development of estuaries and tidal flats, followed by a lagoon sedimentary stage from marsh to sea with carbonate precipitation in an area protected from waves, ending with a retraction leading to the accumulation of evaporites.[4]
A detailed facies analysis of the formation was performed by Armas and Sánchez in 2015, where the authors concluded the formation represents a hybrid coastal system of tidal flats, dominated by Atlantic ingressions, with a large storm influence in some areas linked to aeolian systems.[5]
Fossil content
Dinosaurs
Dinosaur eggs are known from the formation.[6]
- Sauropods
| Sauropods reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Aeolosaurus | Indeterminate | Lower | Шаблон:Center | |||
|
B.reigi[7] |
Río Negro Province[7] | Lower | Braincases, caudal vertebrae, and several limb elements | Шаблон:Center | ||
| Menucocelsior | M. arriagadai | Lower | Seventeen caudal vertebrae and several appendicular bones: a right humerus, a left fibula and some metapodial. | Шаблон:Center | ||
| Panamericansaurus | P. schroederi | "Five tail vertebrata, sacral vertebrae, left humerus and rib fragments" | Шаблон:Center | |||
| Pellegrinisaurus? | P. powelli | Lower (if it is from the formation) | "Dorsal and caudal vertebrae, partial femur" | Шаблон:Center | ||
| Rocasaurus | R. muniozi | Lower | "Partial postcranial skeleton" | Шаблон:Center | ||
- Ornithiscians
- Ankylosaurs
| Ankylosaurs reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Patagopelta | P. cristata | Lower | Tooth, three posterior dorsal vertebrae, caudal vertebrae, two caudal centra, right femur, partial cervical half ring, and osteoderms. | Шаблон:Center | ||
- Hadrosaurs
| Hadrosaurs reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Bonapartesaurus | B. rionegrensis | Lower | ||||
| Kelumapusaura | K. machi | Upper | Partial skull, a cervical vertebrae, several sacrals, sternal rib and sternal plate and multiple referred specimens found in a bonebed | Шаблон:Center | ||
| Lapampasaurus | L. cholinoi | Lower | Elements of the axial and appendicular skeleton of a subadult individual | Шаблон:Center | ||
| Willinakaqe | W. salitralensis | Lower | Шаблон:Center | |||
- Theropods
| Theropods reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Austroraptor | A. cabazai | Lower | ||||
| Bonapartenykus | B. ultimus | Upper | ||||
| Lamarqueavis | L. australis | Lower | "Right coracoid with damaged sternal and omal extremities, and lacking acrocoracoidal process" | Шаблон:Center | ||
| Limenavis | L. patagonica | Lower | "Partial forelimb" | Шаблон:Center | ||
| Niebla | N. antiqua | Upper | Braincase, fragmentary jaw and teeth, relatively complete scapulocoracoid, dorsal ribs, and incomplete vertebrae. | [8] | ||
| Quilmesaurus | Q. curriei | Upper | Femur and distal tibia | Шаблон:Center | ||
Pterosaurs
Fragmentary fossils are known from the formation.[6]
| Pterosaurs reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Aerotitan | A. sudamericanus | Bajo de Arriagada | Uppermost Allen Fm. | Partial rostrum | The first unambiguous azhdarchid from South-America[9] | |
Fish
| Fish reported from the Allen Formation[3] | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Diplomystidae | indeterminate | 4 incomplete pectoral spines | ||||
| Siluriformes | indeterminate | 5 incomplete pectoral spines | ||||
| Lepisosteidae | indeterminate | 6 vertebral centra | ||||
| Teleostei | indeterminate | 10 isolated teeth | ||||
| cf. Percichthyidae | indeterminate | 19 fragmentary vertebrae | ||||
| Ceratodontiformes | indeterminate | 3 tooth plates | ||||
| Chondrichthyes | indeterminate | 11 vertebral centra | ||||
Squamata
| Squamates reported from the Allen Formation[3] | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Patagoniophis | P. parvus | incomplete trunk vertebra | ||||
| Alamitophis | A. argentinus | incomplete trunk vertebra | ||||
| Madtsoiidae | indeterminate | incomplete trunk vertebra | ||||
Rhynchocephalia
| Rhynchocephalia reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Lamarquesaurus | L. cabazai | Cerro Tortuga | [10] | |||
Plesiosauria
| Plesiosaurs reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Kawanectes | K. lafquenianum | |||||
Frogs
Unnamed frogs belonging to the family Calyptocephalellidae and Leptodactylidae, and those with no family designation were also found.[11][3]
| Frogs reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Kuruleufenia | K. xenopoides | Pipid frog.[12] | ||||
Mammals
The mammal fauna of the Allen Formation is known from seven teeth, which document the presence of several species.[13]
| Mammals reported from the Allen Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Location | Material | Notes | Images |
| Mesungulatum | M. lamarquensis | Cerro Tortuga | Two upper molars and a fragmentary lower molar | A dryolestoid | |
| Groebertherium | G. stipanicici | Cerro Tortuga | One upper molar | A dryolestoid | |
| cf. Brandonia | sp. | Cerro Tortuga | One lower molar | A dryolestoid | |
| Barberenia | B. allenensis | Cerro Tortuga | One upper molariform | A dryolestoid | |
| Trapalcotherium | T. matuastensis | Cerro Tortuga | One first lower molar | A gondwanathere | |
Plants
| Plants reported from the Allen Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Podocarpoxylon | P. mazzonii | Valcheta Petrified Forest, Río Negro Province.[14] | Fossil wood.[14] | |||
See also
- List of dinosaur-bearing rock formations
- Adamantina Formation
- La Colonia Formation
- Lecho Formation
- Los Alamitos Formation
- Los Llanos Formation
- Marília Formation
References
Bibliography
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSA
- Шаблон:Cite LSAШаблон:ISBN
Further reading
- ↑ Salgado et al., 2007
- ↑ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 600-604. Шаблон:ISBN.
- ↑ 3,0 3,1 3,2 3,3 Martinelli, A. and Forasiepi, A.M. (2004). "Late Cretaceous vertebrates from Bajo de Santa Rosa (Allen Formation), Rio Negro province, Argentina, with the description of a new sauropod dinosaur (Titanosauridae)". Revista del Museo Argentino de Ciencias Naturales 6(2): 257–305.
- ↑ 4,0 4,1 Armas & Sánchez, 2015, p.101
- ↑ Armas & Sánchez, 2015, p.110
- ↑ 6,0 6,1 Ошибка цитирования Неверный тег
<ref>; для сносокallenне указан текст - ↑ 7,0 7,1 "63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Page 604.
- ↑ Шаблон:Cite journal
- ↑ Novas et al., 2012
- ↑ Apesteguía & Rougier, 2007, p.3
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Rougier et al., 2009
- ↑ 14,0 14,1 Шаблон:Cite journal
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