Marine Isotope Stage 3 (MIS 3) Versus Marine Isotope Stage 5 (MIS 5) Fossiliferous Marine Deposits from Uruguay

Rojas, Alejandra; Martínez, Sérgio

doi:10.1007/978-3-319-40000-6_14

Cited by 8 publications

(28 citation statements)

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“…These lithostratigraphic units include a similar lithologic composition, that varies from clays to coarse sands, and even conglomerates (Preciozzi et al, 1988;Goso, 2006;Ubilla and Martínez, 2016). For this reason, other criteria such as stratigraphic relationships or fossiliferous content have been invoked to distinguish between both units (see discussion in Martínez and Ubilla, 2004;Rojas and Martínez, 2016;Ubilla and Martínez, 2016). In a recent review of the geology and palaeontology of the Uruguayan Quaternary strata, Ubilla and Martínez (2016) referred the La Coronilla deposit to the Chuy Formation.…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

“…A predominantly autochthonous-parautochthonous assemblage, and a proximal depositional environment protected from waves have been inferred (see Martínez et al, 2001;Rojas, 2007;Rojas and Martínez, 2016;Rojas et al 2018).…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

“…More recently, the incorporation of radiocarbon dating of shells from selected localities enabled a satisfactory discrimination between Pleistocene and Holocene deposits (e.g. Martínez et al, 2001Martínez et al, , 2006Rojas, 2002Rojas, , 2007Martínez and Ubilla, 2004;Martínez and Rojas, 2013;Rojas and Martínez, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The 14 C ages from the three mentioned deposits range between 29500 and 35500 years BP, and were interpreted by the authors as minimum ages. In consequence, the assemblages were considered to be older than the numerical ages obtained and probably deposited during the Last Interglacial (see discussion in Rojas and Martínez, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Rojas et al (2014) recorded the presence of Oichnus simplex on a plate of the chiton Chaetopleura angulata, the first report of this ecological interaction in the fossil record. Recently, Rojas and Martínez (2016) updated the molluscan content and discussed the age of Pleistocene assemblages from Uruguay. Regarding the La Coronilla deposit, the authors listed 26 gastropod and 40 bivalve species derived from the review of the specimens studied in Martínez et al (2001) and from the unpublished thesis by Rojas (2007).…”

Section: Introductionmentioning

confidence: 99%

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New Molluscan Records and Palaeoecology of the Late Pleistocene Marine Assemblage From La Coronilla (Rocha, Uruguay) /Novos Registros E Palaeoecologia De Moluscos Da Associação Marinha Pleistocénica De La Coronilla (Rocha, Uruguai)

2018

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The Late Pleistocene marine molluscan assemblage from La Coronilla is one of the richest Quaternary marine deposit from Uruguay. This contribution represents an update of the bivalve and gastropod species composition of this deposit and includes a palaeoecological analysis of the molluscan fauna. The ecological preferences of the recorded species allowed the reconstruction of the palaeoenvironmental conditions of the eastern Uruguayan coast and the palaeobiogeographic scenario of the area during the Late Pleistocene. The fossil assemblage of La Coronilla contains 91 bivalve and gastropod taxa of which 28 are new to this deposit and 11 are first reported for the Uruguayan Quaternary marine assemblages. The latest are Turbonilla abrupta, Turbonilla cf. farroupilha, Turbonilla brasiliensis, Turbonilla cf. deboeri, Turbonilla penistoni, Turbonilla turris, Olivella defiorei, Eurytellina angulosa, Kellia sp., Paraleptopecten bavayi, and Pandora sp. Almost all recorded species from the assemblage are marine and live in soft bottoms, although hard/consolidated substrate species and microgastropods that live in ecological interaction with other invertebrate taxa were also found. The high percentage of tropical-subtropical species, the absence of cold-water species, and the record of extralimital warm water northern species, adds new evidence for the inference of warmer than present conditions in the Uruguayan coast during the Late Pleistocene. ResumoA associação de moluscos marinhos do Pleistoceno Superior de La Coronilla é um dos mais ricos depósitos marinhos Quaternários do Uruguai. Esta contribuição representa uma revisão da composição de espécies de bivalves e gastrópodes deste depósito e inclui uma análise paleoecológica da fauna de moluscos. As preferências ecológicas das espécies registradas permitiram a reconstrução das condições paleoambientais da costa leste uruguaia e do cenário paleobiogeográfico da área durante o Pleistoceno Superior. A associação fóssil de La Coronilla contém 91 taxa de bivalves e gastrópodes, dos quais 28 são novos neste depósito e 11 são relatados pela primeira vez nas associações marinhas quaternárias uruguaias. São elas Turbonilla abrupta, Turbonilla cf. farroupilha, Turbonilla brasiliensis, Turbonilla cf. deboeri, Turbonilla penistoni, Turbonilla turris, Olivella defiorei, Eurytellina angulosa, Kellia sp., Paraleptopecten bavayi e Pandora sp. Quase todas as espécies registradas na associação são marinhas e vivem em fundos constituídos por sedimentos móveis, embora também sejam encontradas espécies de substratos duros/sedimentos consolidados e microgastrópodes que vivem em interação ecológica com outros taxa de invertebrados. A alta percentagem de espécies tropicais-subtropicais, a ausência de espécies de água fria e o registro de espécies que com habitats não limitados às águas quentes do norte, constituem novas evidências da ocorrência de condições mais quentes do que as atuais na costa uruguaia durante o Pleistoceno Superior.

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Section: Study Area and Geological Settingmentioning

confidence: 99%