Produção Nacional
TAFOFLÓRULA MONTE MOR DO ESTADO DE SÃO PAULO: SEUS ELEMENTOS E SEU SIGNIFICADO NO GONDWANA INFERIOR DO BRASIL
1975; Sociedade Brasileira de Geologia; Volume: 5; Issue: 1 Linguagem: Inglês
10.25249/0375-7536.1975114
ISSN2177-4382
Autores Tópico(s)Fern and Epiphyte Biology
ResumoA study of the Monte Mor florula (Itu Formation, Tubarão Group in the State of São Paulo indicates that it is composed of gondwanic elements "mixed" with other boreal and cosmopolitan genera. Association of arborescent Lycopsida and Sphenopsida with Botrychiopsis, Rhacopteris, Adiantites, etc., and complete absence of Glossopterids point out a general Carboniferous age for the flora, posibly Westphalian-Stephanian. The same age was deduced by Trindade (1970). Ocurrence of cf. Leaia and eurypterid associated with Lepidodendron, Lycopodiopsis, Paracalamites, Sphenopteris and numerous seeds Cordaicarpus and araucaroid conifers such as Paranocladus may signify a lacustrine environment for deposition of plant fragments and, possibly, formation of Monte Mor coal beds. The state of preservation of megaplants showing decorticated stems corroborates this idea, since they are indicative of short transportation of the plant fragments and at least a semi-autoctone origin for the coal beds. The mixture of boreal and cosmopolitan elements in the Monte Mor taphoflorula could be explained by the existence of a zonal paleoclimatic differentiation during the Upper Carboniferous, leading to the migration of pioneer elements toward nearby continental masses.
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