CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Permineralized woods from Upper Carboniferous – Lower Permian of the Itararé group, Brazil
Autor/es:
GNAEDINGER S; KLOSTER ADRIANA; ADAMI-RODRIGUES, KAREN; URBAM, CAMILE; SCOMAZZON ANA KARINA
Reunión:
Conferencia; IAWA Pan American meeting; 2012
Resumen:
The anatomy of petrified woods from Upper Carboniferous - Lower Permian of the Paraná Basin, Brazil were studied. The fossil woods occur in the upper part of the Itararé Group, in Mafra – Santa Catarina, at the Campáleo Outcrop, located along route BR-280. The following genera were recognized: Agathoxylon Hartig and Abietopitys Kräusel, which are distinguished by intertracheary and cross-field pitting and ray characters. The Agathoxylon sample has uniseriate and multiseriate, contiguous and alternate intertracheary radial wall pits; araucarioid cross-field pits and short uniseriate homocellular rays. The Abietopitys samples has uniseriate-biseriate pits, alternate, contiguous and separate intertracheary pitting on radial walls, araucarioid-cupressoid cross-field pits, and homocellular predominantly uniseriate rays with nodular thickenings on the cell walls. Comparisons are made with other species of the Agathoxylon and Abietopitys described for the same period from Gondwana. Abietopitys is characteristic of the Carboniferous and Permian of Argentina, Brazil and Africa; whereas, Agathoxylon has a wider distribution (Carboniferous- Tertiary). Because fossil woods usually are not found in organic connection with other parts such as leaves or reproductive organs, the botanical affinities of most Paleozoic woods are difficult to be determined