Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina

The Cenozoic paleofloras in the area of San Carlos de Bariloche, Argentina are located mainly along the Ñirihuau and Pichileufú rivers, and belong to several stratigraphie units. Of these, the flora of Pico Quemado is situated in the most basal part of the Ñirihuau Formation and is probably late Oli...

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Autores principales: Falaschi, P., Del Carmen Zamaloa, M., Caviglia, N., Romero, E.J.
Formato: JOUR
Materias:
Cenozoic
Gymnosperms. megafossils
Microfossils
Patagonia
fossil record
gymnosperm
lacustrine deposit
Miocene
Oligocene
paleobotany
river system
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v49_n4_p525_Falaschi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00027014_v49_n4_p525_Falaschi2023-10-03T13:53:13Z Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina Falaschi, P. Del Carmen Zamaloa, M. Caviglia, N. Romero, E.J. Cenozoic Gymnosperms. megafossils Microfossils Patagonia fossil record gymnosperm lacustrine deposit Miocene Oligocene paleobotany river system Argentina The Cenozoic paleofloras in the area of San Carlos de Bariloche, Argentina are located mainly along the Ñirihuau and Pichileufú rivers, and belong to several stratigraphie units. Of these, the flora of Pico Quemado is situated in the most basal part of the Ñirihuau Formation and is probably late Oligocene-early Miocene in age. It is described herein, gymnospermous foliar impressions and compressions of Araucaria nathorstii Dusén (section Araucaria) and an ovuliferous scale of Araucariaceae; the latter constitutes the first evidence of reproductive structures belonging to section Araucaria for the Cenozoic of South America. Foliar impressions and compressions of Podocarpaceae are also present. Among them, the presence of podocarps with bilateral leaves related to Dacrycarpus de Laubenfels, previously known from Eocene outcrops of Chile, Argentina and Antarctica, allows extending their record up to the late Oligocene-early Miocene of Patagonia and relating them with the fossil and extant floras from the Australasian region. The morphology of the studied leaves, as well as their affinities with extant forms, together with the sedimentology, palynology, angiospermous megaflora and presence of freshwater bivalvia, allow suggesting a fluvial-shallow lacustrine depositional setting, developed under temperate to warm-temperate and humid climate. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v49_n4_p525_Falaschi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cenozoic
Gymnosperms. megafossils
Microfossils
Patagonia
fossil record
gymnosperm
lacustrine deposit
Miocene
Oligocene
paleobotany
river system
Argentina
spellingShingle Cenozoic
Gymnosperms. megafossils
Microfossils
Patagonia
fossil record
gymnosperm
lacustrine deposit
Miocene
Oligocene
paleobotany
river system
Argentina
Falaschi, P.
Del Carmen Zamaloa, M.
Caviglia, N.
Romero, E.J.
Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina
topic_facet Cenozoic
Gymnosperms. megafossils
Microfossils
Patagonia
fossil record
gymnosperm
lacustrine deposit
Miocene
Oligocene
paleobotany
river system
Argentina
description The Cenozoic paleofloras in the area of San Carlos de Bariloche, Argentina are located mainly along the Ñirihuau and Pichileufú rivers, and belong to several stratigraphie units. Of these, the flora of Pico Quemado is situated in the most basal part of the Ñirihuau Formation and is probably late Oligocene-early Miocene in age. It is described herein, gymnospermous foliar impressions and compressions of Araucaria nathorstii Dusén (section Araucaria) and an ovuliferous scale of Araucariaceae; the latter constitutes the first evidence of reproductive structures belonging to section Araucaria for the Cenozoic of South America. Foliar impressions and compressions of Podocarpaceae are also present. Among them, the presence of podocarps with bilateral leaves related to Dacrycarpus de Laubenfels, previously known from Eocene outcrops of Chile, Argentina and Antarctica, allows extending their record up to the late Oligocene-early Miocene of Patagonia and relating them with the fossil and extant floras from the Australasian region. The morphology of the studied leaves, as well as their affinities with extant forms, together with the sedimentology, palynology, angiospermous megaflora and presence of freshwater bivalvia, allow suggesting a fluvial-shallow lacustrine depositional setting, developed under temperate to warm-temperate and humid climate.
format JOUR
author Falaschi, P.
Del Carmen Zamaloa, M.
Caviglia, N.
Romero, E.J.
author_facet Falaschi, P.
Del Carmen Zamaloa, M.
Caviglia, N.
Romero, E.J.
author_sort Falaschi, P.
title Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina
title_short Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina
title_full Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina
title_fullStr Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina
title_full_unstemmed Gymnosperm flora from the Nirihuau formation (late oligocene-early miocene), RFO negro Province, Argentina
title_sort gymnosperm flora from the nirihuau formation (late oligocene-early miocene), rfo negro province, argentina
url http://hdl.handle.net/20.500.12110/paper_00027014_v49_n4_p525_Falaschi
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AT delcarmenzamaloam gymnospermflorafromthenirihuauformationlateoligoceneearlymiocenerfonegroprovinceargentina
AT caviglian gymnospermflorafromthenirihuauformationlateoligoceneearlymiocenerfonegroprovinceargentina
AT romeroej gymnospermflorafromthenirihuauformationlateoligoceneearlymiocenerfonegroprovinceargentina
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