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Introduction
Publications
Publications (45)
In order to understand the complex evolutionary processes and patterns that explain current island biodiversity, large datasets and long-term analysis are required. The Last Interglacial (LIG) was one of the warmest interglacials during the last million years. How species mobility changed during this period in the Macaronesia geographical region ha...
Molluscan death assemblages occurring on present-day beaches frequently consist of secondary-colored shells, with yellow to brown and gray to black colors. It is hypothesized that this secondary coloration can be related to postmortem age and to conditions in the taphonomically active zone, altering shells to black and gray tones in reducing condit...
Rapana venosa (Valenciennes, 1846) is an invasive gastropod, the arrival of which in the Río de La Plata estuary 22 years ago is well-documented. Rapana venosa shells were collected during two sampling events from four beaches with different substrate types and wave energy regimes to compare the taphonomic attributes under different environmental c...
The bioinvader bivalve Corbicula fluminea (Müller, 1774) is known in the Río de la Plata River since about 35 years ago. This time lapse fills a gap in taphonomical studies, that comprises usually strictly contemporaneous or at best centuries-old phenomena. We sampled shells of this species in one locality in two occasions with the same methodology...
NOTA RESUMEN La tafonomía actualista permite conocer las condiciones ambientales que influyen en la preservación de restos biológicos, e inferir las condiciones de acumulación de restos fósiles. Se explora el uso del gasterópodo invasor Rapana venosa (Valenciennes, 1846) en el Río de la Plata como modelo de tafonomía actualista, utilizando sus rasg...
Adequate values of environmental parameters are crucial for the long-term preservation of the fossils in a palaeontological collection. In particular, incorrect or fluctuating temperature (T) and relative humidity (RH) can affect glued or repaired materials, induce the proliferation of mould, provoke mechanical breakage, recrystallization or minera...
Shelly death assemblages are major sources of information for Actualistic Taphonomy studies. They preserve a sample, often biased, of the living communities, provide biostratinomic evidence useful for taphonomic analyses, allow one to establish shell time averaging and residence time, and are valuable resources in conservation paleobiology studies....
The use of alien invasive species is applied for the first time to evaluate the taphonomic damage during a period of up to two decades, in natural conditions. A preliminary study using shells of the gastropod Rapana venosa collected in a microtidal beach showed that the specimens suffered important damage in the considered time span, comparable wit...
Highlighting the latest research on Actualistic Taphonomy (AT), this book presents the outcomes of a meeting that took place in Montevideo, Uruguay, in October 2017. Its respective chapters offer valuable insights into South American archaeology, invertebrate and vertebrate fauna, and flora.
In recent years, there has been a surge of new research o...
The Southern Brazilian or Rio Grande do Sul Coastal Plain (RGSCP) represents the final onshore sedimentation of the Pelotas Basin. It was formed by four lagoon-barrier system depositional events tentatively attributed to MIS 11, 9, 5, and 1. Mollusk assemblages were studied mostly from outcrops, giving scarce and contradictory numerical ages. Here...
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 a...
Mollusc-rich shell concentrations are an important source of palaeontological information. Fidelity of fossil assemblages, sedimentologic, stratigraphic and palaeoenvironmental analysis, taphonomic processes and time-averaging are among the most explored topics in shell bed studies. Here, we present a preliminary taphonomic analysis of the Late Ple...
Uruguay
has several marine deposits
of undoubtedly Late Pleistocene
age, but there is conflicting evidence when comparing ages obtained by different methods. While 14C datings suggest younger ages (related to Marine Isotope Stage 3—MIS 3), OSL, where available, indicate older times (related to Marine Isotope Stage 5—MIS 5). The analysis of the abun...
A fossil assemblage collected around 3.5 m amsl from Ezeiza, Buenos Aires province, have AMS 14C ages of ca. 33,000 to ca. 40,000 yr BP, whereas in the literature is a report of a conventional 14C age of >43,000 yr BP. An OSL age from the overlying deposit corresponds to ca. 22,000 yr. The samples contain marine fossils: mollusks, balanids and cora...
Drillholes represent direct evidence of ecological interactions in the fossil record. Most of them have been interpreted as predatory in origin and enable the analysis of behavioral information of both predator and prey. Drillholes have been found in a variety of fossil organisms, but this is the first report of a bored fossil chiton plate. It was...
Criticisms of Bracco et al. (2013) about Martínez and Rojas (2013) are commented. We still claim that the sea level curve shown in the latter paper is the first statistically, testable curve produced for Uruguay. Previous attemps were made by hand. With the exception of some typographical errors correctly signaled by Bracco et al. (2013), it is dem...
Along the coast of the Southwestern Atlantic area, there are two currents which cause the thermal gradient in the region: the warm Brazilian current, flowing from north to south, and the cold Malvinas (Falkland) one (MC), that flows northwards. Both currents converge at about the isobaths of 100 and 200 m developing a complex oceanographic area pla...
Quaternary molluskan faunas, specially the Holocene ones, are relatively abundant along the eastern coast of the Southern South American continent and have been studied with different scopes by Feruglio (1933, 1950), Aguirre and Whatley (1995), Forti-Esteves (1974), Martínez et al. (2001, 2006), De Souza et al. (2010) and Aguirre et al. (2011) (and...
As stated in previous chapter, temperature is the main factor influencing the distribution of recent Southwestern Atlantic molluskan species, and surely, the same situation prevailed during Pleistocene and Holocene times. But, as already discussed, the spatial distribution of species was not exactly the same than today in similar latitudes. In this...
The present paper records almost two-thirds more species in the Holocene than in the Pleistocene, as a consequence of three main factors: 1—the Pleistocene is under-represented, with a less number of recognized deposits than the Holocene; 2—the rather bad preservation of Pleistocene shells; 3—there are still many Pleistocene deposits that have not...
Early essays on the regionalization of the marine fauna were made by Dana (1853), Forbes (1856), and in reference to mollusks, by Woodward (1856) in his Manual of Conchology. Lately, several authors improved the knowledge of the global distributional patterns of the marine organisms; Briggs (1995) among others offered a synthesis. A tripartite sche...
The water circulation pattern outlined in Chap. 2 is the result of the paleogeographical changing that underwent the area because of the fragmentation of the Gondwana since Late Mesozoic times (Potter 1997; Veroslavsky et al. 2003). Although preliminary analysis performed by del Río et al. (2012) proved that the recent composition of Southwestern A...
Here we present a revision of the fossil record of chitons (Mollusca, Polyplacophora) of Late Pleistocene and Holocene marine deposits of Uruguay and discuss their potential for palaeoenvironmental reconstruction. Chitons were recorded as isolated valves in bivalve- and gastropod-rich assemblages. They are represented by the species Chaetopleura an...
The Palaeontological Collection at Facultad de Ciencias (Montevideo, Uruguay) is the most diverse palaeontological collection in Uruguay, both in terms of taxonom- ic and chronostratigraphic scope. It dates back to about 1953 and supports research, teaching and outreach at the institution. During most of its existence, the care of the Palaeontologi...
RESUMEN La revisión de las faunas de moluscos terciarias del Atlántico sur indica que los orígenes de las asociaciones actuales pueden comenzar a trazarse desde el Mioceno Tardío aunque las especies durante ese tiempo formaban unidades biogeográficas diferentes a las actuales, debido a un también diferente patrón circulatorio oceánico. Hasta el mom...
Dates of marine Holocene molluscs from Uruguay (Villa Soriano Formation) range from 6849 to 1858 cal. years BP. There are no significative gaps among the different ages obtained, with the exception of the interval 2276-2830 calculated years BP. Two kinds of concentrations are distinguished: autochthonous, for which a low energy depositional environ...
Hasta el momento han sido citadas 142 especies de moluscos marinos y estuarinos para el Cuaternario de Uruguay. Esta fauna está compuesta taxonómicamente de la siguiente forma: Polyplacophora (2 especies), Scaphopoda (1), Gastropoda (66) y Bivalvia (73).
Pintosaurus magnidentis gen. et sp. nov., a latest Permian procolophonoid reptile from the Buena Vista Formation of Uruguay, is described and its relationships are considered. The new taxon is characterized by the absence of a lateral maxillary depression, a premaxilla with a dorsally expanded maxillary process, a maxilla-premaxillary junction almo...
Piniosaurus magnidentis gen. et sp. nov., a latest Permian procolophonoid reptile from the Buena Vista Formation of Uruguay, is described and its relationships are considered. The new taxon is characterized by the absence of a lateral maxillary depression, a premaxilla with a dorsally expanded maxillary process, a maxilla-premaxillary junction almo...
Knowledge of the continental Quaternary molluscs of Northern Uruguay is good at a regional scale. Presently, around 23 genera or species level taxa are recorded. Molluscs are often found as fossil concentrates, and rarely as isolated shells. All species are extant, and all except two are present today in the geographic area studied. All properly id...
Dinosaur remains from the lower part of the Tacuarembó Formation, Uruguay, consist of the isolated theropod teeth described here. This is the first record of this group in the Tacuarembó Formation and represents the oldest dinosaur remains from Uruguay.
Priohybodus cf. P. arambourgi is reported for the first time from the Tacuarembó Formation of Uruguay. This species is a hybodontid shark known previously only from Upper Jurassic and Lower Cretaceous deposits of Saharan Africa and the Arabian Peninsula. The material (22 isolated teeth and a dorsal fin spine) was found in a thin bone bed, associate...
Minimum radiocarbon ages of marine Pleistocene molluscs from Uruguay range from 29,500±600 to 35,500±1900 14C yr B.P. Because knowledge of the marine Quaternary stratigraphy of Uruguay remains inadequate, no attempt is made to correlate between these deposits and recognized lithostratigraphic units. Analysis of the temperature and salinity ranges o...
