Abstract

The present work represents a preliminary synthesis of ali the trilobites quoted in the Spanisl-i areas of the Hesperian Massif so far, The main findings are analyzed from a chronostratigraphical and geographical point of view, and the differences between the successive trilobite associations are shown, as well as their significance from a palaeobiogeographical point of view. The utility of these organisms for the biostratigraphical characterization of deposits belonging to several Departamento de Paleontologia e Instituto de Geologia Economica (CSIC * UCM), Facultad de Ciencias Geologicas, Universidad Complutense, Ciudad Universitaria. 28040 - Madrid. 267 epochs and the problems derived of their correlation with other areas are also studied.

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