Redirigiendo al acceso original de articulo en 21 segundos...
Inicio  /  Andean Geology  /  Vol: 33 Núm: 1 Par: 0 (2006)  /  Artículo
ARTÍCULO
TITULO

Upper Triassic Palaeobotany of Biobío river valley, Chile: Filicopsida Class.

Marcelo Leppe    
Philippe Moisan    
Eduardo Abad    
Sylvia Palma-Heldt    

Resumen

The Upper Triassic (Carnian-Norian) Filicopsida fossils present in the marine and continental outcrops, informally nominated as Santa Juana formation in the Biobío Region of Chile (37ºS/73ºS), are described. The taphoflora includes ten species, out of which eight are first registers for this area: Gleichenites quilacoyensis Leppe and Moisan sp. nov., Asterotheca rigbyana rigbyana Herbst, Rienitsia colliveri Herbst, Dictyophyllum fuenzalidai Herbst, Dictyophyllum (Thaumatopteris) rothi Frenguelli, Chansitheca argentina Herbst, Cladophlebis kurtzi Frenguelli and Todites baldoni Herbst ; three are new records for the Chilean Upper Triassic: Rienitsia colliveri Herbst, Gleichenites quilacoyensis Leppe and Moisan sp. nov., and Chansitheca argentina Herbst. The fern species found represents an 18% of the total specific diversity of plants in the Upper Triassic rocks from Biobío and help to understand the complicate floristic evolution of the communities in Gondwana. The Triassic rocks from Biobío are situated in the context of the Southwestern Extratropical Gondwana. The assemblage was developed in a continental environment with strong marine influence, under a rainy seasonal weather and displays age affinities with the argentinian Florian stage (Norian-Rhaetian). On an evolutionary point of view, the paleoflora was involved into the long Triassic/Jurassic mass extinction process, that means the end of the 'Dicroidium Flora' and the start of several elements that will dominate during the Jurassic.

 Artículos similares

       
 
Luis A. Spalletti, Carlos O. Limarino     Pág. 328 - 338
The end of the Permian period is marked by global warming and the biggest known mass extinction on Earth. The crisis is commonly attributed to the formation of large igneous provinces because continental volcanic emissions have the potential to control a... ver más
Revista: Andean Geology

 
Elena Previtera, Adriana C. Mancuso, Marcelo S. De la fuente, Eloy S. Sánchez     Pág. 197 - 214
The Puesto Viejo Group crops out in the San Rafael Block, southwest Mendoza, Argentina. This group is an important unit for the knowledge theTriassic faunas. It is composed of basal Quebrada de los Fósiles Formation (QF) overlying by the Río Seco de la Q... ver más
Revista: Andean Geology

 
Sebastian Rocher,Graciela Vallecillo     Pág. 589 - 625
The Permo-Triassic Choiyoi rhyolite province of Chile and Argentina is by its extension, volume and geological significance, the record of one of the most important magmatic events of the southwestern margin of Gondwana. However, aspects dealing with the... ver más
Revista: Andean Geology

 
Stella Poma,Eduardo O. Zappettini,Sonia Quenardelle,Joao O. Santos,?Magdalena Koukharsky,Elena Belousova,Neal J. McNaughton     Pág. 267 - 292
We have carried out zircon U-Pb SHRIMP dating and Hf isotope determinations as well as geochemical analyses on three plutonic units of Gondwanan magmatism that crop out in NW Argentina. Two episodes of different age and genesis have been identified. The ... ver más
Revista: Andean Geology

 
Luis A. Spalletti,Ernesto Schwarz,Gonzalo D. Veiga     Pág. 401 - 435
This study presents and discusses inorganic geochemical data from the basal Vaca Muerta Formation, deposited during the early Tithonian marine transgression of the Neuquén Basin. This interval is associated with high preservation of organic matter and is... ver más
Revista: Andean Geology