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Paleomagnetic constraints on the age of the Botucatu Formation in Rio Grande do Sul, southern Brazil Anais da ABC (AABC)
Tamrat,Endale; Ernesto,Marcia.
Paleomagnetic and rockmagnetic data are reported for the aeolian Botucatu Formation, in the southern Brazilian State of Rio Grande do Sul. Oriented samples were taken from a section located between the cities of Jaguari and Santiago. After thermal and alternating field demagnetization, both normal and reversed characteristic remanent magnetizations were found. These results yielded 13 reversed and 5 normal polarity sites, composing a magnetostratigraphic column displaying a sequence of reversed-normal-reversed polarity events. The paleomagnetic pole calculated for 18 sites is located at 114.7ºE, 78.5ºS (dp=8.1º; dm=1.2º), after restoring the strata to the paleohorizontal. This paleomagnetic pole indicates a Late Jurassic-Early Cretaceous age to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paleomagnetism; Botucatu Formation; Magnetostratigraphy; Magnetic anisotropy; Late Jurassic.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300016
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Integration of sedimentology and ground-penetrating radar for high-resolution imaging of a carbonate platform ArchiMer
Jorry, Stephan; Bievre, Gregory.
Ground-penetrating radar has not been applied widely to the recognition of ancient carbonate platform geometries. This article reports the results of an integrated study performed on an Upper Jurassic outcrop from the south-east Paris basin, where coral bioherms laterally change into prograding depositional sequences. Ground-penetrating radar profiles illustrate the different bedding planes and major erosional unconformities visible at outcrop. A ground-penetrating radar profile conducted at the base of the cliff displays a palaeotopographic surface on which the outcropping bioherms settled. The excellent penetration depths of the ground-penetrating radar (20 m with a monostatic 200 MHz antenna) images the carbonate platform geometries, ranging between...
Tipo: Text Palavras-chave: Carbonate platform; Coral bioherms; Ground-penetrating radar; Late Jurassic; Paris Basin.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00047/15864/13440.pdf
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Rudists and the Pacific in the Late Jurassic and Early Cretaceous Naturalis
Skelton, P.W.; Sano, S.; Masse, J.-P..
The Pacific dimension of Late Jurassic to Early Cretaceous rudist evolution shows four phases, which are described in this article in more detail.
Tipo: Article / Letter to the editor Palavras-chave: Rudists; Pacific; Late Jurassic; Early Cretaceous; Evolution; 38.22; 42.73.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/428063
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