Consulta: subjectFacets:"Chronology"
Registros recuperados: 4
Data/hora: 15/06/2024 14:09:47

An optimized scheme of lettered marine isotope substages for the last 1.0 million years, and the climatostratigraphic nature of isotope stages and substages
Provedor de dados: 5
Autores: Railsback, L. Bruce; Gibbard, Philip L.; Head, Martin J.; Voarintsoa, Ny Riavo G.; Toucanne, Samuel.
A complete and optimized scheme of lettered marine isotope substages spanning the last 1.0 million years is proposed. Lettered substages for Marine Isotope Stage (MIS) 5 were explicitly defined by Shackleton (1969), but analogous substages before or after MIS 5 have not been coherently defined. Short-term discrete events in the isotopic record were defined in the 1980s and given decimal-style numbers, rather than letters, but unlike substages they were neither intended nor suited to identify contiguous intervals of time. Substages for time outside MIS 5 have been lettered, or in some cases numbered, piecemeal and with conflicting designations. We therefore propose a system of lettered substages that is complete, without missing substages, and optimized to...
Tipo: Text
Palavras-chave: Substages; Stages; Marine isotope stages; MIS; Chronology; Chronostratigraphy; Climatostratigraphy.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00251/36216/35796.pdf

Sequence of events from the onset to the demise of the Last Interglacial: Evaluating strengths and limitations of chronologies used in climatic archives
Provedor de dados: 5
Autores: Govin, A.; Capron, E.; Tzedakis, P. C.; Verheyden, S.; Ghaleb, B.; Hillaire-marcel, C.; St-onge, G.; Stoner, J. S.; Bassinot, F.; Bazin, L.; Blunier, T.; Combourieu-nebout, N.; El Ouahabi, A.; Genty, D.; Gersonde, R.; Jimenez-amat, P.; Landais, A.; Martrat, B.; Masson-delmotte, V.; Parrenin, F.; Seidenkrantz, M. -s.; Veres, D.; Waelbroeck, C.; Zahn, R.
The Last Interglacial (LIG) represents an invaluable case study to investigate the response of components of the Earth system to global warming. However, the scarcity of absolute age constraints in most archives leads to extensive use of various stratigraphic alignments to different reference chronologies. This feature sets limitations to the accuracy of the stratigraphic assignment of the climatic sequence of events across the globe during the LIG. Here, we review the strengths and limitations of the methods that are commonly used to date or develop chronologies in various climatic archives for the time span (similar to 140 -100 ka) encompassing the penultimate deglaciation, the LIG and the glacial inception. Climatic hypotheses underlying record...
Tipo: Text
Palavras-chave: Last Interglacial; Penultimate deglaciation; Last glacial inception; Chronology; Corals; Speleothems; Ice cores; Marine sediments; Peat and lake sediments; Climate dynamics.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00496/60802/64786.pdf

A study of nivicolous Myxomycetes in southern Europe, Sierra de Guadarrama, Spain
Provedor de dados: 16
Autores: Sánchez, A.; Moreno, G.; Illana, C.; Singer, H.
Eleven taxa of Myxomycetes collected from around melting snow banks in mountainous and alpine areas of the Sierra de Guadarrama (Madrid, Segovia) are presented. From a chronological point of view several new records for the Iberian Peninsula are interesting: Lepidoderma carestianum, Lepidoderma granuliferum, Physarum albescens, Physarum alpestre and Trichia sordida var. sordida. SEM micrographs of spores and capillitia of the most significant species are included. Key words: nivicolous Myxomycetes, Physarales, Stemonitales, Trichiales, Spain, SEM, chronology, taxonomy.
Tipo: Article / Letter to the editor
Palavras-chave: Nivicolous Myxomycetes Physarales Stemonitales Trichiales Spain SEM; Chronology; Taxonomy.
Ano: 2002
URL: http://www.repository.naturalis.nl/record/532092

Contribution to the stratigraphy of the onshore Paraíba Basin, Brazil
Provedor de dados: 42
Autores: Rossetti,Dilce F.; Góes,Ana M.; Bezerra,Francisco H.R.; Valeriano,Márcio M.; Brito-Neves,Benjamim B.; Ochoa,Felipe L.
Several publications have contributed to improve the stratigraphy of the Paraíba Basin in northeastern Brazil. However, the characterization and distribution of sedimentary units in onshore areas of this basin are still incomplete, despite their significance for reconstructing the tectono-sedimentary evolution of the South American passive margin. This work provides new information to differentiate among lithologically similar strata, otherwise entirely unrelated in time. This approach included morphological, sedimentological and stratigraphic descriptions based on surface and sub-surface data integrated with remote sensing, optically stimulated luminescence dating, U+Th/He dating of weathered goethite, and heavy mineral analysis. Based on this study, it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphology; Sedimentology; Stratigraphy; Chronology; Tectonics; Paraíba Basin.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200007