Asociaciones palinológicas con angiospermas en el Cretácico Superior de la Cuenca Neuquina, Argentina

Abstract

Rev. bras. paleontol. 13(2):143-158, Maio/Agosto 2010

A mid-Cretaceous palynoflora with Tucanopollis crisopolensis from D-129 Formation, San Jorge Gulf Basin, Argentina

“…The presence of angiosperm pollen grains in the Clavatipollenites pollen assemblage recovered from the outcrops of Sierra Silva was reported by the author (Vallati, 1996(Vallati, , 2002(Vallati, , 2006. New data from this pollen assemblage, including regional correlation and biogeographic aspects are herein presented within the framework of studies involving cretaceous angiosperm grains from northern and central argentine Patagonia (Vallati, 2002(Vallati, , 2006(Vallati, , 2010.…”

“…Podocarpaceaen pollen is very rare and the plicate grains of the Ephedraceae, that appear well diversifi ed in other Cretaceous patagonian palynofl oras (Vallati, 1995(Vallati, , 2010, were not recognized in the present assemblage.…”

“…Among these, the Aptian Ranquiles Formation (Huitrín-Rayoso Group) and middle and Late Cretaceous formations (Neuquén Group) in the Neuquén Basin as well as the Albian Kachaique Formation in the Austral Basin. All of them include pollen grains endemic and/or typical in Cretaceous northern Gondwana phytoprovinces as Afropollis spp., Schrankipollis, Elateroplicites africaensis, Confossia vulgaris, Cretacaeiporites spp., Tricesticillus with different levels of participation within the corresponding assemblages (Vallati, 2002(Vallati, , 2006(Vallati, , 2010Barreda & Archangelsky, 2006).…”

“…Similar characteristics can be found in the Early-mid Cretaceous palynofl oras of the Equatorial Region, where the climatic conditions were interpreted as warm and arid or semiarid. However, plicate pollen of Gnetophyta affinity, abundant in northern gondwanan palynofloras (Herngreen et al, 1996) and well diversifi ed in cretaceous palynofl oras from northern Patagonia (Vallati, 2006(Vallati, , 2010, is not found in the D-129 assemblage.…”

First megafloristic record for the Chubut Group at Somuncurá-Cañadón Asfalto Basin: An angiosperm dominated flora from the Upper Cretaceous Puesto Manuel Arce Formation, Patagonia Argentina

“…Romero and Arguijo, 1981;Romero and Archangelsky, 1986;Papú, 1989;Romero, 1993;Passalia et al, 2001;Llorens, 2003;Cúneo and Gandolfo, 2005;Gandolfo and Cúneo, 2005;Quattrocchio et al, 2005;Barreda and Archangelsky, 2006;Iglesias et al, 2007;Passalia, 2007;Narv aez and Sabino, 2008;Povilauskas et al, 2008;Puebla, 2009;Vallati, 2010Vallati, , 2013Perez Loinaze et al, 2012;Archangelsky and Archangelsky, 2013;Povilauskas, 2013). Most of these Cretaceous records are concentrated in two time intervals: the Aptian (late Barremian?)…”