Primeiro Registro De Fósseis De Aves Marinhas Na Planície Costeira Do Rio Grande Do Sul, Brasil

Lopes, Renato Pereira; Buchmann, Francisco Sekiguchi de Carvalho; Caron, Felipe

doi:10.25249/0375-7536.2006364648650

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…This process seems to be the main one responsible for the low proportion of large cranial and postcranial remains of large-bodied taxa such as sloths, toxodontids and gomphotheriids. While smaller, more compact remains of small-bodied taxa are easily transported by waves under normal conditions, the larger elements can be transported only by high energy waves, which occur only during extreme storms (Calliari et al, 1998;Lopes et al, 2006). Thus, these large remains rarely come to the beach, but once deposited there, would be removed only by a similar storm, so their residence time on the beach is longer than that of a small fossil continuously moved by normal wave regimes.…”

Section: Discussionmentioning

confidence: 99%

“…During autumn and winter, storm waves erode these concentrations and transport the fossils to the beach, where they are collected. Besides terrestrial mammals, the concentrations also contain remains of marine mollusks , corals, echinoderms, crustaceans (Buchmann, 1994;Lopes, 2011), teleost (Richter, 1987) and elasmobranch fishes (Buchmann & Rincón Filho, 1997), pinnipeds (Oliveira & Drehmer, 1997), cetaceans (Cunha, 1982;Ribeiro et al, 1998), seabirds (Lopes et al, 2006) and reptiles (Hsiou & Fortier, 2007;Hsiou, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Representativity of Quaternary mammals from the Southern Brazilian continental shelf

Aires¹,

Lopes²

2012

Rev. bras. paleontol.

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Fossils of terrestrial mammals from the southern Brazilian continental shelf have been known since the late 19th century. The fossils are relatively common and represent several taxonomic groups of the Pleistocene megafauna. Although the systematics of the fossil assemblage is well known, the relative proportions among taxonomic groups and their skeletal elements have not been evaluated yet. Here are presented the results of a survey of the diversity of skeletal elements and taxa among 2,391 specimens belonging to the paleontological collection of the Universidade Federal do Rio Grande (FURG). The survey revealed that the most common taxa are the artiodactyls, ground sloths, glyptodontids and toxodontids, while carnivores, rodents and litopterns are very scarce. The most abundant skeletal elements are osteoderms of cingulates (mostly glyptodontids) and teeth of other groups. Although paleoecological and paleoenvironmental inferences are very hard to obtain because the fossils do not have a stratigraphic setting, encompass a wide time span, of some 700 ky BP, and represent several environments and climates, some patterns of taxonomic abundance are apparently related to ecological factors, while others seem to result from taphonomic processess.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Representativity of Quaternary mammals from the Southern Brazilian continental shelf

Aires¹,

Lopes²

2012

Rev. bras. paleontol.

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“…Although remains of several marine organisms such as teleost and elasmobranch fishes (Richter, 1987;Buchmann and Rincón Filho, 1997), shellfish (Figueiredo (1975); , echinoderms, crustaceans (Buchmann, 1994;Lopes, 2009), pinnipeds (Oliveira and Drehmer, 1997), cetaceans (Cunha, 1982;Ribeiro et al, 1998) and seabirds (Lopes et al, 2006) are found in these concentrations, the most remarkable are the fossils of terrestrial mammals (Fig. 2).…”

Section: Fossils From the Inner Continental Shelfmentioning

confidence: 97%

Pleistocene mammals from the southern Brazilian continental shelf

Lopes

Buchmann

2011

Journal of South American Earth Sciences

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a b s t r a c tFossils of terrestrial mammals preserved in submarine environment have been recorded in several places around the world. In Brazil such fossils are rather abundant in the southernmost portion of the coast, associated to fossiliferous concentrations at depths up to 10 m. Here is presented a review of such occurrences and the first record of fossils in deeper areas of the continental shelf. The fossils encompass several groups of both extinct and extant mammals, and exhibit several distinct taphonomic features, related to the marine environment. Those from the inner continental shelf are removed and transported from the submarine deposits to the coast during storm events, thus forming large konzentrat-lagerstätte on the beach, called "Concheiros". The only fossils from deeper zones of the shelf known so far are a portion of a skull, a left humerus and of a femur of Toxodon sp. and a lower right molar of a Stegomastodon waringi, all collected by fishermen at depths around 20 m. The presence of fossils at great depths and distances from the present coastline, without signs of abrasion and far from areas of fluvial discharges does indicate that these remains have not been transported from the continent to the shelf, but have been preserved directly on the area that today correspond to the continental shelf. These remains indicate the existence of large fossiliferous deposits that have developed during periods of sealevel lowstand (glacial maxima) and have been submerged and reworked by the sea-level rise at the end of the last glaciation.

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“…These fossils are rolled and collected at the beach, being similar to those from Arroio Chuí, and associated to marine fossils (Ribeiro et al, 1998). They present dark coloration, high density and carbonate cement, suggesting reworking by the marine ambient (Lopes et al, 2001). After the deposition in lagoonal ambient (probably the Lagoon III), posterior to the fossilization process, they were reworked and cemented by calcium carbonate in a marine shore environment and preserved in sandstones and carbonate in the parcels and submerged banks (foreshore and continental platform).…”

Section: P R O V a Smentioning

confidence: 99%

Contribution to the knowledge of Hemiauchenia paradoxa (Artiodactyla, Camelidae) from the Pleistocene of southern Brazil

Scherer¹

2007

RBP

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-A description of the dentition and anterior and posterior limbs of new specimens of Hemiauchenia paradoxa Gervais & Ameghino is presented. The materials come from Santa Vitória do Palmar, Uruguaiana, Alegrete, Itaqui and Dom Pedrito municipalities in the Rio Grande do Sul State, southern Brazil. New characters supporting distinction between Hemiauchenia paradoxa and Palaeolama major Liais in the dental morphology and limb dimensions, are here presented: proportions of the mandible, morphology of the lingual lophs and labial lophids of molar teeth, size of protostylid and parastylid of the molars and the proportions of distal segments of limbs. Studies with material of other South American regions could contribute for the distinction between these taxa, and between the others camels of South American Pleistocene.Key words: Hemiauchenia paradoxa, Camelidae, Artiodactyla, Pleistocene, Rio Grande do Sul State, Brazil. RESUMO -É aqui apresentado a descrição da dentição e de membros anteriores e posteriores de novos espécimes deHemiauchenia paradoxa Gervais & Ameghino. Os materiais são provenientes dos municípios de Santa Vitória do Palmar, Uruguaiana, Alegrete, Itaqui e Dom Pedrito no Rio Grande do Sul, sul do Brasil. Novos caracteres que suportam a distinção entre Hemiauchenia paradoxa e Palaeolama major Liais na morfologia dentária e dimensões pós-cranianas são aqui apresentados: proporções da mandíbula, morfologia dos lofos linguais e lófidos labiais nos dentes molares, tamanho do protostilido e parastilido nos molares e proporções dos segmentos distais dos membros. Estudos com material de outras regiões da América do Sul poderão melhor contribuir para a distinção entre estes táxons, bem como entre os demais camelídeos do Pleistoceno sul-americano. Palavras-chave: Hemiauchenia paradoxa,

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Primeiro Registro De Fósseis De Aves Marinhas Na Planície Costeira Do Rio Grande Do Sul, Brasil

Cited by 8 publications

References 3 publications

Representativity of Quaternary mammals from the Southern Brazilian continental shelf

Representativity of Quaternary mammals from the Southern Brazilian continental shelf

Pleistocene mammals from the southern Brazilian continental shelf

Contribution to the knowledge of Hemiauchenia paradoxa (Artiodactyla, Camelidae) from the Pleistocene of southern Brazil

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