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Registros recuperados: 3
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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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Cenozoic trace fossils of the Cruziana, Zoophycos and Nereites ichnofacies from the Fuegian Andes, Argentina Ameghiniana
López Cabrera,María I.; Olivero,Eduardo B.; Carmona,Noelia B.; Ponce,Juan J..
The systematics, paleoenvironmental implications, and diversity of Cenozoic trace fossils from the Fuegian Andes are studied. The relatively complete Paleocene-Miocene stratigraphic column includes ichnoassemblages of the Cruziana (Leticia Formation, late Middle Eocene), Zoophycos and Nereites (Early Eocene-Early Miocene turbidite systems) ichnofacies. The last two ichnoasemblages contain the only known deep marine Cenozoic trace fossils in Argentina. The late Middle Eocene Leticia Formation represents a transgressive-regressive cycle and bears the ichnogenera Curvolithus, Diplocraterion, Gyrochorte, Rosselia, Patagonichnus, Asterosoma, Palaeophycus, Paradictyodora, Planolites, Rhizocorallium, Schaubcylindrichnus, Taenidium, and Teichichnus. Ichnogenera of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fuegian Andes; Cenozoic; Ichnology; Graphoglyptids; Turbidites.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200011
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Patagonichnus: a new trace fossil from the Miocene of Patagonia. A probable fodinichnion of gregarious polychaetes Ameghiniana
Olivero,Eduardo B.; López Cabrera,María I..
Miocene tidal deposits from Las Grutas, Patagonia, Argentina, superbly preserve cylindrically laminated burrow systems including Asterosoma radiciforme von Otto and three compound ichnospecies of the newly proposed ichnogenus Patagonichnus ; P. calyciformis n. isp.; P. stratiformis n. isp.; and P . thalassiformis n. isp. Together with large, palmate burrows, probably produced by crustacean decapods, they are elite trace fossils. The Patagonichnus burrow systems consist of many distinctive concentrically laminated elementary components including: horizontal and vertical, conical and helicoidal bulbs and swellings; vertical shafts; straight and paired branches; and cone-in-cone structures. Hollow, branched, straight or helicoidal inner lined tubes connect...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trace fossils; Patagonichnus; Asterosoma; Miocene; Patagonia; Ethology; Polychaetes.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200002
Registros recuperados: 3
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