Permian floras from Carapacha Basin, central Argentina. Description and importance

This paper completes the taxonomic description of the recently discovered Permian "Glossopteris" taphofloras from Carapacha Basin and compares its entire paleofloristic assemblage with other known Permian plant associations from Argentina. Carapacha Basin was a halfgraben located in the so...

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Autores principales: Melchor, R.N., Césari, S.N.
Formato: JOUR
Materias:
Argentina
Glossopteris
Megaflora
Permian
South America
Taxonomy
glossopteris
megaflora
taxonomy
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00166995_v30_n5_p607_Melchor
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00166995_v30_n5_p607_Melchor
record_format dspace
spelling todo:paper_00166995_v30_n5_p607_Melchor2023-10-03T14:14:32Z Permian floras from Carapacha Basin, central Argentina. Description and importance Melchor, R.N. Césari, S.N. Argentina Glossopteris Megaflora Permian South America Taxonomy glossopteris megaflora Permian taxonomy Argentina This paper completes the taxonomic description of the recently discovered Permian "Glossopteris" taphofloras from Carapacha Basin and compares its entire paleofloristic assemblage with other known Permian plant associations from Argentina. Carapacha Basin was a halfgraben located in the southern region of La Pampa province (central Argentina) that received fluvial/lacustrine sediments from Early Permian to Late Permian times. On the basis of their Glossopteris leaves, two paleofloristic associations are recognized. The older Estancia San Roberto (ESR) association contains leaves with scarce and narrow anostomoses, whereas the younger Curacó River (CR) association has glossopterid leaves with distinct and complex anastomoses, plus glossopterid fructifications. In both taphofioras sphenopsid stems, ferns, and petrified gymnosperm wood were also identified. Curacó River association -described in this paper- includes eleven types of glossopterid leaves, as follows: Gangamopteris sp., Glossopteris browniana BRONGNIART, 1828, G. damudica FEISTMANTEL, 1881, G. cf. G. euryneura MAHESHWARI, 1965, G. pampeana MELCHOR & CÉSARI nov. sp., G. argentina ARCHANGELSKY, 1958b, G. wilsonii (SEWARD) ARCHANGELSKY et al. 1981, G. communis FEISTMANTEL, 1876, G. tortuosa ZEILLER, 1902, G. cf. G. pandurata PANT & GUPTA, 1971, and Glossopteris sp. From the same association we also describe scale leaves, Dictyopteridium sp., Neomariopteris sp., Phyllotheca sp., and Cordaites sp. The composition of both associations allows to relate them to the Gangamopteris biozone (ESR association) and Dizeugotheca superzone (CR association) of early Early Permian and late Early Permian to Late Permian age, respectively. In particular, the last association has strong affinities with the exuberant flora from La Golondrina Basin (Patagonia). The paleoflora recovered from Carapacha Basin is meaningful because it is a new permian record from a geographic area with intermediate position among basins of northwest and west Argentina, Buenos Aires Province, Patagonia and Malvinas/Falkland Islands. The compositional differences among these paleofloras can be accounted for paleoenvironmental, local geographic and taphonomic factors. Furthermore, its presence does not support the hypothesis of allochthony of Patagonia for Permian times. Fil:Césari, S.N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00166995_v30_n5_p607_Melchor
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Glossopteris
Megaflora
Permian
South America
Taxonomy
glossopteris
megaflora
Permian
taxonomy
Argentina
spellingShingle Argentina
Glossopteris
Megaflora
Permian
South America
Taxonomy
glossopteris
megaflora
Permian
taxonomy
Argentina
Melchor, R.N.
Césari, S.N.
Permian floras from Carapacha Basin, central Argentina. Description and importance
topic_facet Argentina
Glossopteris
Megaflora
Permian
South America
Taxonomy
glossopteris
megaflora
Permian
taxonomy
Argentina
description This paper completes the taxonomic description of the recently discovered Permian "Glossopteris" taphofloras from Carapacha Basin and compares its entire paleofloristic assemblage with other known Permian plant associations from Argentina. Carapacha Basin was a halfgraben located in the southern region of La Pampa province (central Argentina) that received fluvial/lacustrine sediments from Early Permian to Late Permian times. On the basis of their Glossopteris leaves, two paleofloristic associations are recognized. The older Estancia San Roberto (ESR) association contains leaves with scarce and narrow anostomoses, whereas the younger Curacó River (CR) association has glossopterid leaves with distinct and complex anastomoses, plus glossopterid fructifications. In both taphofioras sphenopsid stems, ferns, and petrified gymnosperm wood were also identified. Curacó River association -described in this paper- includes eleven types of glossopterid leaves, as follows: Gangamopteris sp., Glossopteris browniana BRONGNIART, 1828, G. damudica FEISTMANTEL, 1881, G. cf. G. euryneura MAHESHWARI, 1965, G. pampeana MELCHOR & CÉSARI nov. sp., G. argentina ARCHANGELSKY, 1958b, G. wilsonii (SEWARD) ARCHANGELSKY et al. 1981, G. communis FEISTMANTEL, 1876, G. tortuosa ZEILLER, 1902, G. cf. G. pandurata PANT & GUPTA, 1971, and Glossopteris sp. From the same association we also describe scale leaves, Dictyopteridium sp., Neomariopteris sp., Phyllotheca sp., and Cordaites sp. The composition of both associations allows to relate them to the Gangamopteris biozone (ESR association) and Dizeugotheca superzone (CR association) of early Early Permian and late Early Permian to Late Permian age, respectively. In particular, the last association has strong affinities with the exuberant flora from La Golondrina Basin (Patagonia). The paleoflora recovered from Carapacha Basin is meaningful because it is a new permian record from a geographic area with intermediate position among basins of northwest and west Argentina, Buenos Aires Province, Patagonia and Malvinas/Falkland Islands. The compositional differences among these paleofloras can be accounted for paleoenvironmental, local geographic and taphonomic factors. Furthermore, its presence does not support the hypothesis of allochthony of Patagonia for Permian times.
format JOUR
author Melchor, R.N.
Césari, S.N.
author_facet Melchor, R.N.
Césari, S.N.
author_sort Melchor, R.N.
title Permian floras from Carapacha Basin, central Argentina. Description and importance
title_short Permian floras from Carapacha Basin, central Argentina. Description and importance
title_full Permian floras from Carapacha Basin, central Argentina. Description and importance
title_fullStr Permian floras from Carapacha Basin, central Argentina. Description and importance
title_full_unstemmed Permian floras from Carapacha Basin, central Argentina. Description and importance
title_sort permian floras from carapacha basin, central argentina. description and importance
url http://hdl.handle.net/20.500.12110/paper_00166995_v30_n5_p607_Melchor
work_keys_str_mv AT melchorrn permianflorasfromcarapachabasincentralargentinadescriptionandimportance
AT cesarisn permianflorasfromcarapachabasincentralargentinadescriptionandimportance
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