Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)

Autores
Carpenter, Raymond J.; Iglesias, Ari; Wilf, Peter
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Premise of research. Cenozoic macrofloras from South America are fundamental for understanding extant Southern Hemisphere biotas. The Paleogene Ligorio Márquez Formation (LMF) straddles the Chile-Argentina border; leaf fossils from its Chilean outcrops were previously assigned to >50 morphotypes and interpreted as primarily representative of tropical-subtropical lineages, with dominance by diverse Lauraceae of extant Neotropical affinities. Here, we present new collections of Argentine LMF mudstones that are thus far unique in the Patagonian region in containing organically preserved plant fossils, including leaves with cuticular preservation. Methodology. Leaf fossils were exposed by splitting blocks of mudstone or collected by flotation from disaggregated samples. Smaller fossils, including reproductive parts, conifer needles, and isolated cuticles, were recovered from sieved slurry. Fossils were examined under light microscopy, epifluorescence, and SEM. Pivotal results. Twenty taxa were recognized from cuticle-bearing leaf fossils or dispersed cuticles. The most abundant leaf species is a morphologically variable form that is like Lauraceae in architecture but with clearly nonlauraceous cuticular details. Four-parted flower fossils are attributable to the same species, and its eudicot affinities are indicated by adherent triaperturate pollen. Lauraceae were present but much less diverse than reported from the LMF in Chile and arguably with Gondwanan (not Neotropical) affinities. Other taxa include the conifers Dacrycarpus chilensis and Coronelia molinae and possibly Cunoniaceae and a new Ginkgoites. A wet mesotherm paleoclimate is inferred. Conclusions. The new fossils complement and improve our understanding of the LMF and contribute to a greater understanding of high southern latitudes at a time when overland dispersal was possible between South America and Australasia. The fossils provide further evidence for warm and humid climates in Patagonia during the early Paleogene and for a strongly Gondwanic flora, with little conclusive evidence of taxa belonging to Neotropical and megatherm lineages.
Fil: Carpenter, Raymond J.. University of Tasmania; Australia
Fil: Iglesias, Ari. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Wilf, Peter. State University of Pennsylvania; Estados Unidos
Materia
CUTICLE
GONDWANA
LAURACEAE
LEAF FOSSIL
PALEOGENE
PATAGONIA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/95634

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network_name_str CONICET Digital (CONICET)
spelling Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)Carpenter, Raymond J.Iglesias, AriWilf, PeterCUTICLEGONDWANALAURACEAELEAF FOSSILPALEOGENEPATAGONIAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Premise of research. Cenozoic macrofloras from South America are fundamental for understanding extant Southern Hemisphere biotas. The Paleogene Ligorio Márquez Formation (LMF) straddles the Chile-Argentina border; leaf fossils from its Chilean outcrops were previously assigned to >50 morphotypes and interpreted as primarily representative of tropical-subtropical lineages, with dominance by diverse Lauraceae of extant Neotropical affinities. Here, we present new collections of Argentine LMF mudstones that are thus far unique in the Patagonian region in containing organically preserved plant fossils, including leaves with cuticular preservation. Methodology. Leaf fossils were exposed by splitting blocks of mudstone or collected by flotation from disaggregated samples. Smaller fossils, including reproductive parts, conifer needles, and isolated cuticles, were recovered from sieved slurry. Fossils were examined under light microscopy, epifluorescence, and SEM. Pivotal results. Twenty taxa were recognized from cuticle-bearing leaf fossils or dispersed cuticles. The most abundant leaf species is a morphologically variable form that is like Lauraceae in architecture but with clearly nonlauraceous cuticular details. Four-parted flower fossils are attributable to the same species, and its eudicot affinities are indicated by adherent triaperturate pollen. Lauraceae were present but much less diverse than reported from the LMF in Chile and arguably with Gondwanan (not Neotropical) affinities. Other taxa include the conifers Dacrycarpus chilensis and Coronelia molinae and possibly Cunoniaceae and a new Ginkgoites. A wet mesotherm paleoclimate is inferred. Conclusions. The new fossils complement and improve our understanding of the LMF and contribute to a greater understanding of high southern latitudes at a time when overland dispersal was possible between South America and Australasia. The fossils provide further evidence for warm and humid climates in Patagonia during the early Paleogene and for a strongly Gondwanic flora, with little conclusive evidence of taxa belonging to Neotropical and megatherm lineages.Fil: Carpenter, Raymond J.. University of Tasmania; AustraliaFil: Iglesias, Ari. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Wilf, Peter. State University of Pennsylvania; Estados UnidosUniversity of Chicago Press2018-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/95634Carpenter, Raymond J.; Iglesias, Ari; Wilf, Peter; Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina); University of Chicago Press; International Journal of Plant Sciences; 179; 2; 2-2018; 115-1351058-5893CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1086/695488info:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/10.1086/695488info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:42:24Zoai:ri.conicet.gov.ar:11336/95634instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:42:24.739CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
title Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
spellingShingle Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
Carpenter, Raymond J.
CUTICLE
GONDWANA
LAURACEAE
LEAF FOSSIL
PALEOGENE
PATAGONIA
title_short Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
title_full Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
title_fullStr Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
title_full_unstemmed Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
title_sort Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
dc.creator.none.fl_str_mv Carpenter, Raymond J.
Iglesias, Ari
Wilf, Peter
author Carpenter, Raymond J.
author_facet Carpenter, Raymond J.
Iglesias, Ari
Wilf, Peter
author_role author
author2 Iglesias, Ari
Wilf, Peter
author2_role author
author
dc.subject.none.fl_str_mv CUTICLE
GONDWANA
LAURACEAE
LEAF FOSSIL
PALEOGENE
PATAGONIA
topic CUTICLE
GONDWANA
LAURACEAE
LEAF FOSSIL
PALEOGENE
PATAGONIA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Premise of research. Cenozoic macrofloras from South America are fundamental for understanding extant Southern Hemisphere biotas. The Paleogene Ligorio Márquez Formation (LMF) straddles the Chile-Argentina border; leaf fossils from its Chilean outcrops were previously assigned to >50 morphotypes and interpreted as primarily representative of tropical-subtropical lineages, with dominance by diverse Lauraceae of extant Neotropical affinities. Here, we present new collections of Argentine LMF mudstones that are thus far unique in the Patagonian region in containing organically preserved plant fossils, including leaves with cuticular preservation. Methodology. Leaf fossils were exposed by splitting blocks of mudstone or collected by flotation from disaggregated samples. Smaller fossils, including reproductive parts, conifer needles, and isolated cuticles, were recovered from sieved slurry. Fossils were examined under light microscopy, epifluorescence, and SEM. Pivotal results. Twenty taxa were recognized from cuticle-bearing leaf fossils or dispersed cuticles. The most abundant leaf species is a morphologically variable form that is like Lauraceae in architecture but with clearly nonlauraceous cuticular details. Four-parted flower fossils are attributable to the same species, and its eudicot affinities are indicated by adherent triaperturate pollen. Lauraceae were present but much less diverse than reported from the LMF in Chile and arguably with Gondwanan (not Neotropical) affinities. Other taxa include the conifers Dacrycarpus chilensis and Coronelia molinae and possibly Cunoniaceae and a new Ginkgoites. A wet mesotherm paleoclimate is inferred. Conclusions. The new fossils complement and improve our understanding of the LMF and contribute to a greater understanding of high southern latitudes at a time when overland dispersal was possible between South America and Australasia. The fossils provide further evidence for warm and humid climates in Patagonia during the early Paleogene and for a strongly Gondwanic flora, with little conclusive evidence of taxa belonging to Neotropical and megatherm lineages.
Fil: Carpenter, Raymond J.. University of Tasmania; Australia
Fil: Iglesias, Ari. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Wilf, Peter. State University of Pennsylvania; Estados Unidos
description Premise of research. Cenozoic macrofloras from South America are fundamental for understanding extant Southern Hemisphere biotas. The Paleogene Ligorio Márquez Formation (LMF) straddles the Chile-Argentina border; leaf fossils from its Chilean outcrops were previously assigned to >50 morphotypes and interpreted as primarily representative of tropical-subtropical lineages, with dominance by diverse Lauraceae of extant Neotropical affinities. Here, we present new collections of Argentine LMF mudstones that are thus far unique in the Patagonian region in containing organically preserved plant fossils, including leaves with cuticular preservation. Methodology. Leaf fossils were exposed by splitting blocks of mudstone or collected by flotation from disaggregated samples. Smaller fossils, including reproductive parts, conifer needles, and isolated cuticles, were recovered from sieved slurry. Fossils were examined under light microscopy, epifluorescence, and SEM. Pivotal results. Twenty taxa were recognized from cuticle-bearing leaf fossils or dispersed cuticles. The most abundant leaf species is a morphologically variable form that is like Lauraceae in architecture but with clearly nonlauraceous cuticular details. Four-parted flower fossils are attributable to the same species, and its eudicot affinities are indicated by adherent triaperturate pollen. Lauraceae were present but much less diverse than reported from the LMF in Chile and arguably with Gondwanan (not Neotropical) affinities. Other taxa include the conifers Dacrycarpus chilensis and Coronelia molinae and possibly Cunoniaceae and a new Ginkgoites. A wet mesotherm paleoclimate is inferred. Conclusions. The new fossils complement and improve our understanding of the LMF and contribute to a greater understanding of high southern latitudes at a time when overland dispersal was possible between South America and Australasia. The fossils provide further evidence for warm and humid climates in Patagonia during the early Paleogene and for a strongly Gondwanic flora, with little conclusive evidence of taxa belonging to Neotropical and megatherm lineages.
publishDate 2018
dc.date.none.fl_str_mv 2018-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/95634
Carpenter, Raymond J.; Iglesias, Ari; Wilf, Peter; Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina); University of Chicago Press; International Journal of Plant Sciences; 179; 2; 2-2018; 115-135
1058-5893
CONICET Digital
CONICET
url http://hdl.handle.net/11336/95634
identifier_str_mv Carpenter, Raymond J.; Iglesias, Ari; Wilf, Peter; Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina); University of Chicago Press; International Journal of Plant Sciences; 179; 2; 2-2018; 115-135
1058-5893
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1086/695488
info:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/10.1086/695488
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv University of Chicago Press
publisher.none.fl_str_mv University of Chicago Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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