MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
A Danian subtropical lacustrine palynobiota from South America (Bororó Formation, San Jorge Basin, Patagonia, Argentina)
Autor/es:
SCAFATI, L., MELENDI, D. L. AND VOLKHEIMER, W.
Revista:
Geologica Acta
Editorial:
Universidad de Barcelona / Institut de Ciéncies de la Terra " Jaume Almera"
Referencias:
Lugar: Barcelona. España.; Año: 2009 vol. 7 p. 35 - 35
ISSN:
1695-6133
Resumen:
Abstract. New results on a lacustrine Danian palynological association in extra-andean northern Patagonia (lower memberof the Cerro Bororó Formation, San Jorge Basin, Chubut province, Argentina) are presented. This is a contributionto the largely unexplored field of Paleogene freshwater environments. The palynobiota includes representativesof the kingdoms Protoctista and Plantae. Twelve of the aquatic species are Protoctista. From the nineChlorophyta form-species, four correspond to Botryococcaceae, one to Coelastraceae and four to Zygnemataceae(Gelasinicysta, Schizosporis, Ovoidites, and Pseudoschizaea). The remaining forms are dinoflagellatecysts (Peridinium and dinocyst indet.) and prasinophyceans (Leiosphaeridia). Plants are represented by sporesand pollen of Bryophytes (Sphagnaceae and Ricciaceae), Pteridophytes (Salviniaceae), and Angiosperms(Arecaceae,AraceaeandSparganiaceae/Typhaceae, the latter representing macrophytes living in or near the swampyareas). Other palynomorph groups closely related with biotopes of permanent moisture are dominated by sporesof the families Selaginellaceae, Lycopodiaceae, Cyatheaceae, Schizaeaceae, Polypodiaceae and Psilotaceae.The palynological assemblage reflects a freshwater lacustrine environment that developed in a marine coastalzone nearby brackish coastal swamps. Based on the composition of the palynoflora including palm pollen andother thermophilous taxa, humid, warm climatic conditions are inferred for the area of deposition.Gelasinicysta, Schizosporis, Ovoidites, and Pseudoschizaea). The remaining forms are dinoflagellatecysts (Peridinium and dinocyst indet.) and prasinophyceans (Leiosphaeridia). Plants are represented by sporesand pollen of Bryophytes (Sphagnaceae and Ricciaceae), Pteridophytes (Salviniaceae), and Angiosperms(Arecaceae,AraceaeandSparganiaceae/Typhaceae, the latter representing macrophytes living in or near the swampyareas). Other palynomorph groups closely related with biotopes of permanent moisture are dominated by sporesof the families Selaginellaceae, Lycopodiaceae, Cyatheaceae, Schizaeaceae, Polypodiaceae and Psilotaceae.The palynological assemblage reflects a freshwater lacustrine environment that developed in a marine coastalzone nearby brackish coastal swamps. Based on the composition of the palynoflora including palm pollen andother thermophilous taxa, humid, warm climatic conditions are inferred for the area of deposition. Geologica Acta, Vol.7, Nos 1-2, March-June 2009, 35-61 Available online at www.geologica-acta.com Available online at www.geologica-acta.com Available online at www.geologica-acta.com os 1-2, March-June 2009, 35-61 Available online at www.geologica-acta.comGelasinicysta, Schizosporis, Ovoidites, and Pseudoschizaea). The remaining forms are dinoflagellatecysts (Peridinium and dinocyst indet.) and prasinophyceans (Leiosphaeridia). Plants are represented by sporesand pollen of Bryophytes (Sphagnaceae and Ricciaceae), Pteridophytes (Salviniaceae), and Angiosperms(Arecaceae,AraceaeandSparganiaceae/Typhaceae, the latter representing macrophytes living in or near the swampyareas). Other palynomorph groups closely related with biotopes of permanent moisture are dominated by sporesof the families Selaginellaceae, Lycopodiaceae, Cyatheaceae, Schizaeaceae, Polypodiaceae and Psilotaceae.The palynological assemblage reflects a freshwater lacustrine environment that developed in a marine coastalzone nearby brackish coastal swamps. Based on the composition of the palynoflora including palm pollen andother thermophilous taxa, humid, warm climatic conditions are inferred for the area of deposition. Geologica Acta, Vol.7, Nos 1-2, March-June 2009, 35-61 Available online at www.geologica-acta.com Available online at www.geologica-acta.com Available online at www.geologica-acta.com os 1-2, March-June 2009, 35-61 Available online at www.geologica-acta.com