%0 Journal Article
%T Microf¨®siles (Foraminifera, Ostracoda) y su respuesta a las variaciones paleoambientales: Un ejemplo en la Formaci¨®n Allen (Cret¨¢cico Superior), Cuenca Neuquina, Argentina
%A Carignano
%A Ana Paula
%A Ballent
%A Sara
%J Ameghiniana
%D 2009
%I Scientific Electronic Library Online
%X morphological abnormalities in benthic foraminifer tests and ostracods shells and carapaces from the allen formation (late campanian-early maastrichtian) in northern patagonia, argentina are analized. abnormal tests of protelphidium sp. from the auca mahuevo section (69o00¡äw-37o30¡äs) constitute up to 74% of the total specimens. at the section close to pellegrini lake (68o00¡äw-38o40¡äs), cophinia alleniensis ballent with phenotypic hollow nodes reach near 30% of the total specimens. the sedimentology of the sections and the character of the accompanying microfauna indicate that the morphological deformities in both taxa were probably caused by hypersalinity and/or fluctuations in salinity, and also by eutrophication during deposition of auca mahuevo section. descriptions and systematic updating of both taxa are included.
%K microfossils
%K systematics
%K morphological deformities
%K upper cretaceous
%K argentina.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S0002-70142009000200009&lng=en&nrm=iso&tlng=en