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| Registros recuperados: 48 | |
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| FERREIRA,THAIS M.F.; OLIVARES,ADRIANA ITATI; KERBER,LEONARDO; DUTRA,RODRIGO P.; AVILLA,LEONARDO S.. |
| ABSTRACT Echimyidae (spiny rats, tree rats and the coypu) is the most diverse family of extant South American hystricognath rodents (caviomorphs). Today, they live in tropical forests (Amazonian, coastal and Andean forests), occasionally in more open xeric habitats in the Cerrado and Caatinga of northern South America, and open areas across the southern portion of the continent (Myocastor). The Quaternary fossil record of this family remains poorly studied. Here, we describe the fossil echimyids found in karst deposits from southern Tocantins, northern Brazil. The analyzed specimens are assigned to Thrichomys sp., Makalata cf. didelphoides and Proechimys sp. This is the first time that a fossil of Makalata is reported. The Pleistocene record of echimyids... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caviomorphs; Echimyidae; Fossil record; Quaternary; South America. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300829 |
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| SOUZA,LENA S.B.; ROSSETTI,DILCE F.; ELIAS,VAGNER R.; PRADO,RENATO L.. |
| Studies suggest that the Marajó Island has experienced neotectonic activity during its latest evolution. However, there are no data demonstrating the presence of tectonic structures in its shallow subsurface. This work integrates vertical electric sounding, morphostructural lineaments, and geological data aiming to show fault control on the Late Pleistocene-Holocene sedimentation of this area. Resistivity values were related to mud (< 90 Ωm), clayey sand (90 and 200 Ωm), sand (200 and 500 Ωm), as well as Fe-bearing sand and laterite (> 500 Ωm). The latest values were related to the unconformity with lateritic paleosol at the top of the Barreiras Formation. Despite the values ≤ 500 Ωm of both the Barreiras Formation and the Late Pleistocene-Holocene... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vertical electric sounding; Faults; Quaternary; Marajó Island; Remote sensing. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100073 |
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| Rossetti,Dilce F.; Góes,Ana M.. |
| Marajó Island shows an abundance of paleochannels easily mapped in its eastern portion, where vegetation consists mostly of savannas. SRTM data make possible to recognize paleochannels also in western Marajó, even considering the dense forest cover. A well preserved paleodrainage network from the adjacency of the town of Breves (southwestern Marajó Island) was investigated in this work combining remote sensing and sedimentological studies. The palimpsest drainage system consists of a large meander connected to narrower tributaries. Sedimentological studies revealed mostly sharp-based, fining upward sands for the channelized features, and interbedded muds and sands for floodplain areas. The sedimentary structures and facies successions are in perfect... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Remote sensing; Sedimentology; Paleochannel; Marajó Island; Quaternary. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300017 |
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| Registros recuperados: 48 | |
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