Kainella Walcott, 1925 (Trilobita, Ordovícico Temprano) en el noroeste de Argentina y sur de Bolivia. Importancia Bioestratigráfica.

VACCARI, N.E.,; WAISFELD, B.G.; MARENGO, L; SMITH, L.

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2010 vol. 47 p. 293 - 305

0002-7014

A revision of the Kainella meridionalis Zone from Tremadocian rocks of the Central Andean Basin is carried out. In view that the nominal species is for the moment restricted to its type locality, its biostratigraphic significance is limited. The Kainella merdionalis Zone has been widely used for regional and intercontinental correlations. However, these correlations mostly involved an extended interval that corresponds, in fact, to the whole range of the genus. Species of Kainella recorded in the Northwestern Argentina and South of Bolivia exhibit a relatively wide geographic distribution and a constrained stratigraphic range. On the basis of their record a succession of biozones is proposed, ranging from the basal  Tremadocian to, possible, the early late Tremadocian.  Upon integrated information from several localities the following biozones are proposed: K. andina Zone, K. rugosa Zone, and K. teiichii Zone. Besides, the Jujuyaspis keideli keideli Subzone is here regarded as a Zone. The definition of this succession of biozones represents a significant progress in the establishment of a high resolution biostratigraphic scheme based on trilobites. As well, it provides a general framework to establish more precise correlations in the future.