Nuevos datos sobre la estratigrafía, paleontología y procedencia paleogeográfica del Triásico de las escamas del Corredor del Boyar (Cordillera Bética Occidental)

Abstract

The Upper Triassic of the Boyar Corridor (External zones, Western Betic Cordillera) is constituted by a lower carbonate unit and an upper clayey-sandy unit. Both units provide Upper Carnian palynological associations. Besides, the lower unit contains associations of bivalves similar to those of the alpine «Raibler Schichten». These lithostratigraphic units were deposited in very shallow marine (subtidal) and coastal plain environments (peritidal in a broad sense), that constituted the internal areas of a marine shelf that evolved from mainly carbonatic to siliciclastic along the Uper Triassic. The Triassic of the Boyar Corridor is thinner than the typical Median Subbetic Upper Triassic, but it contains much less clays and evaporites and more carbonate marine intercalations than the former. This fact as well as its tectonic position along the contact between the Median Subbetic and the Penibetie, allow to locate it in the palaeogeographic transition between both domains.