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dc.contributor.author
Carpenter, Raymond J.
dc.contributor.author
Iglesias, Ari
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dc.contributor.author
Wilf, Peter
dc.date.available
2020-01-22T21:47:17Z
dc.date.issued
2018-02
dc.identifier.citation
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
dc.identifier.issn
1058-5893
dc.identifier.uri
http://hdl.handle.net/11336/95634
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
University of Chicago Press
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CUTICLE
dc.subject
GONDWANA
dc.subject
LAURACEAE
dc.subject
LEAF FOSSIL
dc.subject
PALEOGENE
dc.subject
PATAGONIA
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Early cenozoic vegetation in patagonia: New insights from organically preserved plant fossils (ligorio márquez formation, Argentina)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-10-10T13:47:30Z
dc.journal.volume
179
dc.journal.number
2
dc.journal.pagination
115-135
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Chicago
dc.description.fil
Fil: Carpenter, Raymond J.. University of Tasmania; Australia
dc.description.fil
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
dc.description.fil
Fil: Wilf, Peter. State University of Pennsylvania; Estados Unidos
dc.journal.title
International Journal of Plant Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1086/695488
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/10.1086/695488
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