Pennsylvanian
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Biostratigraphy and paleoecology of an unusual palynological record from the Aquidauana Formation, Late Pennsylvanian of Paraná Basin
A Formação Aquidauana é uma unidade sedimentar permocarbonífera, estratigraficamente bem distribuída nas porções norte e noroeste da Bacia do Paraná. Entretanto, poucos dados palinológicos são disponíveis para esta formação, limitando interpretações bioestratigráficas e paleoecológicas acuradas. Uma abundante, diversificada e bem preservada
An. Acad. Bras. Ciênc.. Publicado em: 09/06/2015
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2. Registros palinológicos inéditos nas formações Teresina e Rio do Rasto (Permiano, Grupo Passa Dois, Bacia do Paraná): implicações biocronoestratigráficas e paleoambientais
The Pennsylvanian-Permian interval of the Paraná Basin is relatively well-known on its palynological content. However, little has been published from the Permian Serra Alta, Teresina and lower Rio do Rasto formations (Passa Dois Group). A total of thirty seven core samples were collected along a vertical range of 600 meters of these units in two boreholes i
Publicado em: 2011
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3. Diplognathodus occurrence in the Itaituba Formation, Amazonas Basin, Brazil
A Formação Itaituba possui os estratos carbonáticos mais espessos do Grupo Tapajós. Esta formação contém os depósitos fossilíferos mais diversos e abundantes do Pensilvaniano da Bacia do Amazonas com organismos que representam uma fauna de ambiente marinho normal, incluindo conodontes, fragmentos de peixes, foraminíferos, braquiópodes, equinodermo
Publicado em: 2010
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4. A Carboniferous insect gall: insight into early ecologic history of the Holometabola.
Although the prevalence or even occurrence of insect herbivory during the Late Carboniferous (Pennsylvanian) has been questioned, we present the earliest-known ecologic evidence showing that by Late Pennsylvanian times (302 million years ago) a larva of the Holometabola was galling the internal tissue of Psaronius tree-fern fronds. Several diagnostic cellula
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5. The magnetic polarity stratigraphy of the Mauch Chunk Formation, Pennsylvania
Three sections of Chesterian Mauch Chunk Formation in Pennsylvania have been studied paleomagnetically to determine a Late Mississippian magnetic polarity stratigraphy. The upper section at Lavelle includes a conglomerate with abundant red siltstone rip-up clasts that yielded a positive conglomerate test. All samples were subjected to progressive thermal dem
National Academy of Sciences.
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6. Chloroplast and nuclear gene sequences indicate late Pennsylvanian time for the last common ancestor of extant seed plants.
We have estimated the time for the last common ancestor of extant seed plants by using molecular clocks constructed from the sequences of the chloroplastic gene coding for the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) and the nuclear gene coding for the small subunit of rRNA (Rrn18). Phylogenetic analyses of nucleotide sequences