On the presence of Holochilus brasiliensis (Desmarest, 1819) (Rodentia: Cricetidae: Sigmodontinae) in the late Pleistocene of southern Brazil

Kerber, Leonardo; Lopes, Renato Pereira; Oliveira, Édison Vicente; Ribeiro, Ana María; Pereira, Jamil Corrêa

doi:10.4013/gaea.2012.82.02

Cited by 10 publications

(4 citation statements)

References 24 publications

(41 reference statements)

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“…On the other hand, the organic matter indicates that the Type 2 channels became filled with organic-rich sediments due to reduced flow conditions and development of marshlands in its surroundings. One fossil of a semi-aquatic rodent, Holochilus brasiliensis (Brazilian marsh rat) found in one of these deposits (CH2 in Figure 6D), indicates perennial water bodies with abundant vegetation (Kerber et al 2012), similar to the marshes found in lowland areas of the CPRS today (banhados, sensu Saint-Hilaire 2002). The yellow muddy layer on top of these channels, also observed in other outcrops, suggests that they became inactive and were subject to subaerial weathering and pedogenesis.…”

Section: Fluvial Systemsmentioning

confidence: 90%

The Santa Vitória Alloformation: an update on a Pleistocene fossil-rich unit in Southern Brazil

et al. 2021

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The Santa Vitória Formation is a lithostratigraphic unit known for its fossil assemblage of Pleistocene mammals, established in 1973 from sediments exposed along the banks of Chuí Creek, in the southern coastal plain of the state of Rio Grande do Sul (CPRS), Brazil. The original description was presented in a Masters' dissertation and never formally described in a peer-reviewed publication. Moreover, surveys and fossil collecting efforts developed in the last decade have led to a better understanding of its origin and nature. An updated description of this unit is presented here, which outcrops in areas occupied by barrier-lagoon depositional systems originated by eustatic oscillations. The formation encompasses Middle-Upper Pleistocene fluvial and eolian depositional systems and paleosols formed chiefly of fine to medium quartz sand, with subordinate clay, concentrations of iron and manganese oxides, and caliche nodules of pedogenic origin. It conformably overlies upper shoreface-foreshore marine deposits, and is overlain by loess deposited during the last glacial period. Here is proposed to re-define it as Santa Vitória Alloformation, considering that the use of an allostratigraphic framework to characterize this unit has the practical purpose of grouping depositional systems genetically unrelated to the barrier-lagoon systems.

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Section: Fluvial Systemsmentioning

confidence: 90%

The Santa Vitória Alloformation: an update on a Pleistocene fossil-rich unit in Southern Brazil

et al. 2021

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“…In all three assemblages large-sized herbivores (body mass > 100 kg, following Fariña et al, 1998) are the most abundant taxa (42%), followed by medium-sized taxa (21,8%); no small-sized taxa were identifi ed, and 36,2% of the material could not be assigned to any specifi c group. Although rodents have been found in the Campanha (Kerber & Ribeiro, 2011;Kerber et al, 2012), Chuí Creek (Ubilla et al, 2008;Kerber et al, 2011b;Pereira et al, 2012) and continental shelf , these are very scarce. Considering the large amount of incomplete and fragmented specimens found in the three assemblages, this pattern probably represents a taphonomic bias towards large-bodied taxa, refl ecting the preferential destruction of small-sized remains.…”

Section: Discussionmentioning

confidence: 99%

Post mortem modifications (pseudopaleopathologies) in middle-late Pleistocene mammal fossils from southern Brazil

Lopes

Ferigolo

2015

Rev. bras. paleontol.

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Here are described post mortem modifi cations (pseudopaleopathologies) in 762 specimens of extinct mammals from three middle to late Pleistocene assemblages (Campanha, Chuí Creek and continental shelf) of the state of Rio Grande do Sul, southern Brazil. These assemblages include mostly large-sized herbivores preserved in fl uvial facies, although the assemblage from the shelf consist of remains that were reworked several times by sea-level oscillations. Although some patterns of modifi cation are similar between the assemblages (e.g. post-fossilization plain fractures), others such as the grade of abrasion or weathering varies according to the depositional setting. The scarcity of modifi cations that could be attributed to predators or scavengers indicate that carnivory was not a major process driving the formation of the assemblages. Most of the fossils from the Campanha are complete, but a relatively high proportion of them exhibits advanced stage of weathering, whereas those from Chuí Creek and the continental shelf are mostly unweathered. Most of the remains from the Campanha and Chuí Creek are unabraded, whereas all fossils from the shelf were subject to abrasion. Few fossils exhibit signs of modifi cation by organisms such as plants and insects. Fossils from the continental shelf have crusts of beach rock, and some specimens from the Campanha and Chuí Creek have crusts of calcium carbonate or iron oxide. Besides the abrasion, the main difference between fossils from the continental and marine assemblages is the dark color and higher mechanical resistance of the latter. This difference is related to post depositional geochemical processes in the marine environment. The chemical composition of fossils from Chuí Creek and continental shelf was qualitatively analyzed using energy dispersive X-ray spectrometry (EDX) and compared with recent bones. The results show the presence in the fossils of several elements not found in recent bones, incorporated through diagenetic processes controlled by specifi c conditions of each depositional environment.

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“…An alternative way to assess paleoenvironmental conditions in the coastal Pampa is to use other fossil records as proxies, such as mammalian remains. The co‐occurrence in fossiliferous deposits of the CPRS of species characteristic of wetlands (Kerber et al 2012, Pereira et al 2012) and species indicating dry environments such as rodents and camelids (Kerber et al 2011, Lopes et al 2016) points to significant environmental changes during the late Quaternary, but additional data are required to better characterize such changes.…”

Section: Introductionmentioning

confidence: 99%

Paleoenvironmental changes in the Brazilian Pampa based on carbon and oxygen stable isotope analysis of Pleistocene camelid tooth enamel

Lopes

Scherer

Pereira³

et al. 2023

J Quaternary Science

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Here we present paleoenvironmental and paleoclimatic reconstructions of the Brazilian Pampa based on stable isotopes (δ13C, δ18O) in tooth enamel of the Pleistocene camelids Lama guanicoe and Hemiauchenia paradoxa from the Chuy Creek fossil assemblage, including one H. paradoxa from a stratigraphic level within a loess unit deposited during the Last Glacial Maximum (26.5–19 ka b2k). The δ13C results show that both species fed mostly on C3 plants, although the mixed diets of L. guanicoe included ~30% C4 or CAM plants. H. paradoxa had C3 diets with <10% C4 or CAM plants. Both species exhibit higher δ18O and aridity indexes compared to other mammals from the assemblage, consistent with ingestion of 18O‐enriched water from plants growing in arid/semi‐arid conditions. A comparison with δ13C of camelids from Argentina indicates the camelids from Chuy Creek fed on vegetation similar to that of Dry Pampa, Monte and Patagonic xerophytic steppes. Aridification and expansion of dry steppes in southern Brazil suggest a climate‐driven northeastwards shift of the Arid Diagonal of South America that may have contributed to local extinction of the Pleistocene megafauna. These Lateglacial environmental changes are reflected in the characteristics of the plant and mammalian assemblages of the modern Brazilian Pampa.

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On the presence of Holochilus brasiliensis (Desmarest, 1819) (Rodentia: Cricetidae: Sigmodontinae) in the late Pleistocene of southern Brazil

Cited by 10 publications

References 24 publications

The Santa Vitória Alloformation: an update on a Pleistocene fossil-rich unit in Southern Brazil

The Santa Vitória Alloformation: an update on a Pleistocene fossil-rich unit in Southern Brazil

Post mortem modifications (pseudopaleopathologies) in middle-late Pleistocene mammal fossils from southern Brazil

Paleoenvironmental changes in the Brazilian Pampa based on carbon and oxygen stable isotope analysis of Pleistocene camelid tooth enamel

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