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Titolo:
The Triassic taphoflora of the Parana Basin, southern Brazil: a biostratigraphical approach
Autore:
Guerra-Sommer, M; Cazzulo-Klepzig, M; Iannuzzi, R;
Indirizzi:
Univ Fed Rio Grande Sul, Inst Geociencias, BR-91501970 Porto Alegre, RS, Brazil Univ Fed Rio Grande Sul Porto Alegre RS Brazil BR-91501970 BC, RS, Brazil
Titolo Testata:
JOURNAL OF AFRICAN EARTH SCIENCES
fascicolo: 1, volume: 29, anno: 1999,
pagine: 243 - 255
SICI:
0899-5362(199907)29:1<243:TTTOTP>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTARCTICA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Guerra-Sommer, M Univ Fed Rio Grande Sul, Inst Geociencias, CP 15001, BR-91501970 Porto Alegre, RS, Brazil Univ Fed Rio Grande Sul CP 15001 Porto Alegre RS Brazil BR-91501970 BC
Citazione:
M. Guerra-Sommer et al., "The Triassic taphoflora of the Parana Basin, southern Brazil: a biostratigraphical approach", J AFR EARTH, 29(1), 1999, pp. 243-255

Abstract

A Triassic taphoflora identified in the Central Region of the State of RioGrande do Sul, southern Brazil, represents an important biostratigraphicalstage in the palaeofloristic succession of the Parang Basin. A megafloristic association composed of compressed leaves, fronds and seeds of a 'Dicroidium Flora' shows a predominance of the Dicroidium genus, with several species and other important taxa like Neocalamites sp., Cladophlebis sp., Tetraptilon aff. heteromerum, Ginkgoites antarctica, Sphenobaiera sp., Podozamites sp., Nilssonia sp., Pteruchus sp, and Carpolithus sp. Taking into account the stratigraphical distribution of different species of the Dicroidium genus, a biostratigraphical framework was established. Considering that the recognition of this 'Dicroidium Flora' was based on limited outcrops belonging to one lithostratiphical level (Santa Maria Formation - Passe das Tropas Facies), it was impossible to establish a formal biostratigraphical zonation. Instead, at the present time, an informal floristicinterval, named the 'Dicroidium odontopteroides Flora', is proposed (Late Anisian to Late Ladinian, Middle Triassic). An 'Araucarioxylon Flora' composed of secondary woods of the Araucarioxylon type and stems of Rhexoxylon brasiliensis was also identified several km apart. The compressed fossils ofthe 'Dicroidium Flora' and the petrified stems of the 'Araucarioxylon Flora' could represent different but contemporaneous communities corresponding to fluvial-lacustrine environments. (C) 1999 Elsevier Science Limited. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 16:08:57