Upper Cretaceous dinosaur nesting sites of Río Negro (Salitral Ojo de Agua and Salinas de Trapalcó-Salitral de Santa Rosa), northern Patagonia, Argentina

Salgado, Leonardo; Coria, Rodolfo A.; Ribeiro, Carolina da Silva; Garrido, Alberto C.; Rogers, Raymond R.; Simón, María Edith; Arcucci, Andrea B.; Rogers, Kristina Curry; Paulina‐Carabajal, Ariana; Apesteguı́a, Sebastián; Fernández, Mariela Soledad; García, Rodolfo A.; Talevi, Marianella

doi:10.1016/j.cretres.2006.06.007

Cited by 56 publications

(32 citation statements)

References 11 publications

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“…). In this locality, the Allen Formation, which contains a diverse record of sauropods, foraminifers, palms, conifers and cycads (Ballent, ; Andreis et al ., ; Ancibor, ; Del Fueyo, ; Artabe et al ., , ; Salgado et al ., ), is exposed (Hugo & Leanza, ).…”

Section: Geological Settingmentioning

confidence: 99%

A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales

2012

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The cycads are an ancient group of seed plants. Fossil stems assigned to the Cycadales are, however, rare and few descriptions of them exist. Here, a new genus of cycad stem, Wintucycas gen. nov., is described on the basis of specimens found in the Allen Formation (Upper Cretaceous) at the Salitral Ojo de Agua locality, Río Negro Province, Argentina. The most remarkable features of Wintucyas are: a columnar stem with persistent leaf bases, absence of cataphylls, a wide pith, medullary vascular bundles, mucilage canals and idioblasts; a polyxylic vascular cylinder; inverted xylem; and manoxylic wood. The new genus was included in a phylogenetic analysis and its relationships with fossil and extant genera of Cycadales were examined. In the resulting phylogenetic hypothesis, Wintucycas is circumscribed to subfamily Encephalartoideae, supporting the existence of a greater diversity of this group in South America during the Cretaceous. © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 170, 436–458.

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Section: Geological Settingmentioning

confidence: 99%

A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales

2012

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“…The thick upper subunit is composed of siltstones and mudstones with intercalation of ostracod‐rich limestones and sandy levels. The clutch of dinosaur eggs treated herein was found at the top of a palaeosol developed in a very pale orange (10 YR 8/2), medium‐size grained, sandstone with carbonate cement, probably from the lower subunit of Salgado et al. (2007), as this subunit is the only one containing dinosaur eggs and palaeosols.…”

Section: Geological Settingmentioning

confidence: 79%

“…1). The Allen Formation contains some of the main dinosaur egg‐bearing deposits of the Río Negro Province (Powell 1992; Salgado et al. 2007).…”

Section: Geological Settingmentioning

confidence: 99%

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Fossil cocoons associated with a dinosaur egg from Patagonia, Argentina

Genise¹,

Sarzetti²

2011

Palaeontology

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Eight fossil (Cretaceous) insect cocoons were discovered within the infillings of a broken dinosaur egg of a clutch from a Patagonian locality. Cocoons are considered to be in situ based on detailed preservation of thin, delicate walls with surface texture, infillings that are similar to the surrounding rock matrix and the clustered distribution of cocoons in only one egg out of the clutch of five eggs. According to the shape, size, and thin wall with surface texture, the cocoons are interpreted as having been produced by wasps. The wasps may have been attracted to the egg because of the presence of scavenging insects feeding on the decaying organic matter, or they may have been attracted to spiders feeding on the scavenging insects. In either scenario, after attacking the insects or spiders inside the sand infillings of the egg, the wasp larvae produced the cocoons described herein. The presence of wasps, which are at the top of the scavenging food webs, suggests that a complex community of invertebrates would have developed around rotten dinosaur eggs.

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“…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 Armas andSánchez, 2011, 2013), 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 (Page et al, 1999;Barrio, 1990). The fossil record shows that this formation includes vertebrate skeletal remains, dinosaur eggshells, theropod teeth, remains of birds, scutes from turtles and crocodiles, lungfish teeth, indeterminate plant impressions, freshwater ostracods and fresh and salt water pelecypods (Uliana and Dellapé, 1981;Hugo and Leanza, 2001;Coria et al, 2007;Salgado et al, 2007).…”

Section: Stratigraphy Of the Areamentioning

confidence: 99%

Márgenes costeros híbridos de la Cuenca Neuquina (Formación Allen, Cretácico Superior, Argentina).

Armas

Sánchez

2015

Andgeo

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ABSTRACT. The Allen Formation records the first Ingression Atlantic to the Neuquén Basin during the Late Cretaceous. The definition of lithofacies and facies associations interpretation for stratigraphic sections in Paso Córdoba and Salitral Moreno area, Río Negro, Argentina allowed to establish the depositional system that characterized this transgression in the northeastern edge of the Basin. In this paper we present sedimentological analysis of conglomeratic, sandstone, heterolithic and pelitic facies, which allowed the interpretation of tidal channels (TC), intertidal flats (ITF), stormsinfluenced tidal flat (SITF), subtidal flat (STF) and shoreface deposits (SF) parts of the depositional environment. These deposits represent a sedimentary records preserved example of hybrid systems, in which, the base of the sequence has greater tidal influence, while the upper portion is dominated by wave action. The paleocurrent data indicating a NNW-SSE direction to the shore and correlations and spatial distribution of facies associations propose paleogeographic and paleoenvironmental interpretations to Malargüe Group base. Then in this paper the relationship of this coastal environment presents with wind systems previously defined in this area for the Allen Formation.

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Upper Cretaceous dinosaur nesting sites of Río Negro (Salitral Ojo de Agua and Salinas de Trapalcó-Salitral de Santa Rosa), northern Patagonia, Argentina

Cited by 56 publications

References 11 publications

A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales

A new cycad stem from the Cretaceous in Argentina and its phylogenetic relationships with other Cycadales

Fossil cocoons associated with a dinosaur egg from Patagonia, Argentina

Márgenes costeros híbridos de la Cuenca Neuquina (Formación Allen, Cretácico Superior, Argentina).

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