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A new araucarian fossil species from the Paleogene of southern Argentina Ameghiniana
Panti,Carolina; Césari,Silvia N.; Marenssi,Sergio A.; Olivero,Eduardo B..
A new Araucariaceaea from the Paleogene of Tierra del Fuego Province, Argentina is described. Araucaria pararaucana sp. nov. has imbricate, ovate-lanceolate leaves with an acute apex, characterized by the presence of discontinuous and longitudinally oriented stomatal rows separated by epidermal cells, which may be slightly sinuous. Stomatal guard cell surface is granular. These fossil leaves are compared with the extant sections Bunya, Intermedia and Araucaria. Their anatomical characters along with the external morphology suggest a close affinity with the extant southern Patagonian species A. araucana (Molina) K. Koch. The record of this new late Eocene species provides more evidence for a probable unique representation of Section Araucaria in the area...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gymnosperms; Araucariaceae; Araucaria; Cuticle; Paleogene; Argentina.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100016
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Paleogene flora of the Sloggett Formation, Tierra del Fuego, Argentina Ameghiniana
Panti,Carolina; Marenssi,Sergio A; Olivero,Eduardo B.
In the southeastern corner of the Isla Grande of Tierra del Fuego, southernmost Argentina, small outcrops representing Late Eocene-Early Oligocene sedimentation in fluvial environments, are referred to the Sloggett Formation. This unit crops out along the shores of Bahía Sloggett, where it is represented by carbonaceous mudstones, sandstones and conglomerates. A new paleofloristic collection of this site, originally reported by Andersson at the beginning of the 20th, was collected and analyzed, revealing the presence of gymnosperm and angiosperm leaves. Conifers are represented by probable Podocarpaceae and the presence of Araucariaceae is confirmed by leaves with preserved anatomy. Angiosperms, although fragmentary, have been grouped in morphotypes, which...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fossil leaves; Angiosperm; Gymnosperm; Paleogene; Tierra del Fuego; Argentina.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000400004
Registros recuperados: 2
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