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(2012); ** mean age (U e Pb SHRIMP) of the Candiota, Faxinal and Leão-Butiá coal fi elds obtained in the present study. " height="100" width="auto" style="height:100px;" data-reactid="184"/ABSTRACT: Apresenta-se aqui uma síntese da composição da paleoflora preservada em siltitos argilosos do Membro Siderópolis, Formação Rio Bonito tendo como objetivo estabelecer comparações fitoestratigráficas com outras paleofloras neopensilvanianas e cisuralianas da Bacia do Paraná.

A Formação Rio Bonito, a mais importante das unidades litoestratigráficas portadoras de carvão da Bacia do Paraná, pertence à supersequência Gondwana I (Pensilvaniano-Eotriássico).

Additionally, elements may exist in different isotopes, with each isotope of an element differing only in the number of neutrons in the nucleus.

A particular isotope of a particular element is called a nuclide. That is, at some random point in time, an atom of such a nuclide will be transformed into a different nuclide by the process known as radioactive decay.

In a regional context, the mean age represents a consistent geochronological correlation for the uppermost and more important coal seams in southern Brazilian coalfields, but this assumption does not establish an ash fall origin from a single volcanic event.

(2006) for Irati Formation; : radiometric age (U e Pb SHRIMP) obtained by Rocha-Campos et al.

(2007) for Irati Formation; B radiometric age (LAM-MC-ICP-MS U e Pb) obtained by Mori et al.

Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes, and the current abundances.

It is our principal source of information about the age of the Earth and a significant source of information about rates of evolutionary change.

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