The coupling between tectonic factors and climate processes is a key element in understanding landscape evolution. However, few studies address this issue in the context of unglaciated tropical areas in passive continental margins. Thus, this research aimed to understand the origins and evolution of the geomorphological landscape in the eastern sector of Northeast Brazil along the Late Quaternary, between the Last Interstadial (Marine Isotopic State 3) and the Upper Holocene. The morphostratigraphic approach, coupled with sedimentological analyses and optically stimulated luminescence dating of sediments, showed that the depositional record stored in the landscape ranges from at least 60000years BP until the Upper Holocene. Depositional intervals suggest that there were moments of climatic instability followed by moments of relative geomorphological quiescence. Such active moments coincide chronologically with Heinrich and Dansgaard-Oeschger events, which are likely linked to changes in paleo-pluviosity that might respond to the dismantling of elluvial covers and colluvial deposition in the area. Likewise, reworking of hillslope materials led to increased deposition in the fluvial realm. In addition, such deposits might have been affected by the neotectonic complexity of the area, responsible for the creation of non-concatenated accommodation spaces, indicating a dynamics of uplifting and subsidence of blocks typical of passive margin taphrogenic environments. Therefore, the formative processes that led to the Late Quaternary deposition of sediments in a platform margin context reflect a coupling between tectonic and climatic factors. The former, driven by precipitation variability on a regional scale, triggered fluvial and high-energy hillslope processes that resulted in ubiquitous valley floor and piedmont aggradation, whereas the latter led to the dismantling of local base levels, transforming depositional units into new denudational landforms subject to the current climate dynamics.
Dentifying and characterizing prehistoric sites with paintings and rock engravings, in the State of Pernambuco is a theme researched decades ago, as new sites were discovered by chance. The accelerated process of deterioration of the sites found due to their exposure to natural and anthropic impacts led to the need to systematize the discovery through geomorphological and cartographic planning. The purpose of this project was to document and characterize the discovered cave records more precisely through the use of new georeferenced imagery registration methods with the creation of three-dimensional models. The obtained data are integrated in a relational database enriched with the results of application of physical-chemical and imagery techniques. A detailed diagnosis of the state of conservation of the graphic stock will provide an instrument for planning conservation and preservation.
-REMARKS ON THE SPATIAL ARRANGEMENT OF GIANT SLOTH FOSSIL REMAINS (GENUS EREMOTHERIUM)AT LAGOA URI DE CIMA, PERNAMBUCO, BRAZIL. The results of the study on spatial arrangement, the analysis of marks and the preservation conditions of the giant ground sloth (Eremotherium) remains found in the Lagoa Uri de Cima (Salgueiro, Pernambuco, Brazil), a temporary shallow lake, are presented here. The skeletal elements of the same individual, an adult, found in a restricted area (about 8 m in diameter) and its taphonomic patterns suggest that the animal arrived in the shallow lake as a carcass, and its bones were subsequently spread apart and broken mainly by trampling by other large animals. This taphonomic model also applies to some other Eremotherium individuals found into the "lagoa", but not to all. That means that the sequence of processes affecting the formation of this kind of fossil deposit is generally relatively complex.Key words: taphonomy, weathering, Megatheriidae, Brazil, Northeast region.RESUMO -São aqui apresentados os resultados de um estudo sobre a disposição espacial, análises das marcas e condições de preservação dos restos de preguiça-gigante (Eremotherium) descobertos na Lagoa Uri de Cima (Salgueiro, PE, Brasil). Os elementos esqueléticos de um mesmo indivíduo, um adulto, encontrados em uma área restrita (de cerca 8 m de diâmetro) e seu padrão tafonômico indica que o animal chegou à lagoa no estado de carcaça e seus ossos foram espalhados e danificados subsequentemente, sobretudo pelo pisoteamento de outros animais de grande porte quem transitaram no lugar. Esse modelo tafonômico pode também aplicar-se a alguns outros indivíduos de Eremotherium dessa lagoa, mas não a todos. Isso significa que a série de processos envolvidos na formação de um depósito fossilífero de lagoa é, em geral, relativamente complexa.Palavras-chave: tafonomia, intemperismo, Megatheriidae, Brasil, região Nordeste.
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