Licófitas Cormofíticas Arborescentes do Afloramento Quitéria Formação do Rio Bonito (Bacia do Paraná), RS

Abstract

This study reports on a in situ lycopod assemblage of stumps and trunks from a sand-rich coaly section of the Rio Bonito Formation (Artinskian – Kungurian) in Rio Grande do Sul state. These dense tickets of arborescent forms have been found in situ; their cormose rooting systems are “non stigmarioid”. The variation observed, from elliptical (Brasilodendron type) to rhomboidal (Lycopodiopsis type) leaf cushion in the same specimen indicates that both can represent different levels in the same trunk. Considering that the South Brazilian coals are mainly hipoautochthonous, lycopods of Brasilodendron type could be dominants in the plant forming association of the peat.

Early Permian Palaeofloras From Southern Brazilian Gondwana: A Palaeoclimatic Approach

“…Casts of lycophytes compressed longitudinally occur in the sequence, parallel to bedding, associated to rare fragments of glossopterids and cordaitean leaves. Jasper & Guerra-Sommer (1998) using taphonomic criteria corroborate the hypothesis of lagoon-barrier system for deposition of the sequence.…”

Palaeobotanical evidence of wildfires in the Late Palaeozoic of South America – Early Permian, Rio Bonito Formation, Paraná Basin, Rio Grande do Sul, Brazil

“…Otherwise, the high percentage of Lundbadispora spores, frequently grouped into tetrads together with lycopsid megaspores demonstrates that arborescent lycopsids were also the most important group of the coal generating flora (Jasper et al, 2006;GuerraSommer et al, 2008). Nevertheless, the absence of preserved anatomical features in the external compressed cast fragments identified as Brasilodendron pedroanum (Jasper and Guerra-Sommer, 1998) prevents secure taxonomic affiliation with the charcoal fragments presented here.…”

Depositional cyclicity and paleoecological variability in an outcrop of Rio Bonito formation, Early Permian, Paraná Basin, Rio Grande do Sul, Brazil

“…5) is considered a roof-shale level, according to the criteria of Gastaldo et al (1995). The roof-shale flora is characterized by in situ basal stumps of arborescent, cormose lycophytes identified as Brasilodendrum pedroanum (Jasper and Guerra-Sommer, 1998).…”

“…HST, highstand system tract; TST, transgressive system tract; LST, lowstand system tract; PS, parasequence sensu (a) Alves and Ade (1996) and (b) Holz et al (2000). Andreis, 1983; Rio Genoa Group, Nueva Lubecka Formation, Chubut Province), as well as in the Early Permian of the Brazilian southern Paraná Basin (Jasper and Guerra-Sommer, 1998). These data support a hypothesis about relationships between the spatial and temporal distribution of the arborescent, cormose lycophyte with climatic and tectonic events during the Carboniferous/Early Permian interval in western Gondwanaland.…”