Saline paleolake of the Cañadón Asfalto Formation (Middle-Upper Jurassic), Cerro Cóndor, Chubut province (Patagonia), Argentina

Cabaleri, Nora Graciela; Armella, Claudia; Nieto, Diego G. Silva

doi:10.1007/s10347-004-0042-5

Cited by 30 publications

(21 citation statements)

References 9 publications

(6 reference statements)

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“…Cañadón Asfalto Formation ( Stipanicic et al 1968 ; Rougier et al 2007 ); Middle Jurassic, Aalenian-Bathonian, ca. 176-165 Ma ( Gradstein and Ogg 2009 ; Cabaleri et al 2010 ).…”

Section: Resultsmentioning

confidence: 99%

Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs

Sereno

2012

292

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Heterodontosaurids comprise an important early radiation of small-bodied herbivores that persisted for approximately 100 My from Late Triassic to Early Cretaceous time. Review of available fossils unequivocally establishes Echinodon as a very small-bodied, late-surviving northern heterodontosaurid similar to the other northern genera Fruitadens and Tianyulong. Tianyulong from northern China has unusual skeletal proportions, including a relatively large skull, short forelimb, and long manual digit II. The southern African heterodontosaurid genus Lycorhinus is established as valid, and a new taxon from the same formation is named Pegomastax africanus gen. n., sp. n. Tooth replacement and tooth-to-tooth wear is more common than previously thought among heterodontosaurids, and in Heterodontosaurus the angle of tooth-to-tooth shear is shown to increase markedly during maturation. Long-axis rotation of the lower jaw during occlusion is identified here as the most likely functional mechanism underlying marked tooth wear in mature specimens of Heterodontosaurus. Extensive tooth wear and other evidence suggests that all heterodontosaurids were predominantly or exclusively herbivores. Basal genera such as Echinodon, Fruitadens and Tianyulong with primitive, subtriangular crowns currently are known only from northern landmasses. All other genera except the enigmatic Pisanosaurus have deeper crown proportions and currently are known only from southern landmasses.

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“…Cañadón Asfalto Formation ( Stipanicic et al 1968 ; Rougier et al 2007 ); Middle Jurassic, Aalenian-Bathonian, ca. 176-165 Ma ( Gradstein and Ogg 2009 ; Cabaleri et al 2010 ).…”

Section: Resultsmentioning

confidence: 99%

Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs

Sereno

2012

292

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“…The Cañadón Asfalto Formation is a predominantly lacustrine unit mainly composed of shales, lacustrine limestones and frequent conglomeratic and tuffacious intercalations ( Stipanicic et al, 1967 ; Tasch & Volkheimer, 1970 ; Cabaleri et al, 2010 ). The locality is placed in the Canadón Carrizal, in a section of thin-bedded and strongly silicified lacustrine limestones, probably representing a pan lake ( Cabaleri, Armella & Silva Nieto, 2005 ). The pterosaur bones were found in an extensive bonebed in the upper 5 cm of a limestone bed with a thickness of 15–20 cm; the bonebed can be followed laterally for at least 30 m and might be more extensive.…”

Section: Geological Settingmentioning

confidence: 99%

A Jurassic pterosaur from Patagonia and the origin of the pterodactyloid neurocranium

Codorniú

Paulina‐Carabajal

Pol

et al. 2016

PeerJ

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Pterosaurs are an extinct group of highly modified flying reptiles that thrived during the Mesozoic. This group has unique and remarkable skeletal adaptations to powered flight, including pneumatic bones and an elongate digit IV supporting a wing-membrane. Two major body plans have traditionally been recognized: the primitive, primarily long-tailed paraphyletic “rhamphorhynchoids” (preferably currently recognized as non-pterodactyloids) and the derived short-tailed pterodactyloids. These two groups differ considerably in their general anatomy and also exhibit a remarkably different neuroanatomy and inferred head posture, which has been linked to different lifestyles and behaviours and improved flying capabilities in these reptiles. Pterosaur neuroanatomy, is known from just a few three-dimensionally preserved braincases of non-pterodactyloids (as Rhamphorhynchidae) and pterodactyloids, between which there is a large morphological gap. Here we report on a new Jurassic pterosaur from Argentina, Allkaruen koi gen. et sp. nov., remains of which include a superbly preserved, uncrushed braincase that sheds light on the origins of the highly derived neuroanatomy of pterodactyloids and their close relatives. A µCT ray-generated virtual endocast shows that the new pterosaur exhibits a mosaic of plesiomorphic and derived traits of the inner ear and neuroanatomy that fills an important gap between those of non-monofenestratan breviquartossans (Rhamphorhynchidae) and derived pterodactyloids. These results suggest that, while modularity may play an important role at one anatomical level, at a finer level the evolution of structures within a module may follow a mosaic pattern.

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“…Continental carbonates are rich in palaeoclimatic, palaeoenvironmental and palaeontological information; they are found within all types of land‐based sedimentary systems all over the world (Alonso‐Zarza & Wright, ; Gierlowski‐Kordesch, ; Jones & Renaut, ; Gierlowski‐Kordesch et al ., ), especially in extensional basins (Alonso‐Zarza et al ., ). Reports on continental carbonate deposits in the geological record in South America are scarce and belong mainly to Jurassic and Cretaceous deposits (Bertani & Carozzi, ; Suárez & Bell, ; Rouchy et al ., ; Camoin et al ., ; Cabaleri & Armella, , ; Gómez‐Pérez, ; Tunik, ; Beraldi‐Campesi et al ., ; Cabaleri et al ., , ; Cabaleri & Benavente, ). Reports of Triassic continental carbonates, however, have been non‐existent until now.…”

Section: Introductionmentioning

confidence: 98%

Comparison of lacustrine successions and their palaeohydrological implications in two sub‐basins of the Triassic Cuyana rift, Argentina

et al. 2015

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Continental carbonates are rich in palaeoclimatic, palaeoenvironmental and palaeontological information. While carbonate accumulation mechanisms have been described for many types of continental environments, especially in extensional basins, there are still uncertainties that existing facies models fail to address. The Triassic Cerro de las Cabras and Cerro Puntudo formations are alluvial-fluvial-lacustrine sequences that represent a part of the sedimentary infill of two sub-basins of the Cuyana Basin during the early stages of the Triassic rift in west-central Argentina. Previous work has provided absolute dates, confirming that these deposits are coeval (Anisian) allowing a comparative study of carbonate sedimentation in an extensional tectonic context. The description and origin of freshwater carbonate deposits and their surrounding siliciclastic sediments in specific areas of the Cuyana rift, gives insight into the major factors that control carbonate precipitation in all rift basins, including the characterization of the palaeohydrology and the importance of provenance. The Cerro de las Cabras Formation represents an ephemeral, playa-lake depositional system with subaerial exposure and pedogenesis. Its aggradational succession corresponds to the evaporative facies association lake type, diagnostic of underfilled lake basins where persistently closed surface hydrology can lead to thick evaporites. However, this formation lacks thick evaporites and has microbialitic limestones, pointing to an open groundwater supply. The Cerro Puntudo Formation represents an alkaline playa-lake system fed by groundwater and ephemeral surface-water input. The unit is an aggradational-minor progradational succession, pointing to a fluctuating profundal facies association, suggesting a balanced-filled lake type. These two synchronous, lacustrine depositional systems were influenced by tectonics and climate. Provenance and hydrology are key controls in carbonate accumulation in continental rift basins that must be included in future facies models for continental carbonates. Comparison with other rift basins suggests that application of lake-type characterizations coupled with palaeohydrology and provenance patterns will aid in developing new sedimentation models for freshwater limestones in extensional settings.

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Saline paleolake of the Cañadón Asfalto Formation (Middle-Upper Jurassic), Cerro Cóndor, Chubut province (Patagonia), Argentina

Cited by 30 publications

References 9 publications

Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs

Taxonomy, morphology, masticatory function and phylogeny of heterodontosaurid dinosaurs

A Jurassic pterosaur from Patagonia and the origin of the pterodactyloid neurocranium

Comparison of lacustrine successions and their palaeohydrological implications in two sub‐basins of the Triassic Cuyana rift, Argentina

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