A magnetostratigraphic investigation on a Middle-Late Triassic section outcropping at Cuevas de Ayllón (westernmost margin of the Iberían Ranges, Spain) has been performed. The section most1y consists of a thick sequence of interbedded mudstones and sandstones. The age of the sampled formation has been established as Ladinian-Karnian on the basis of palynological assemblages. 123 samples were subjected to a progressive thermal demagnetization up to 680º C. A multicomponent magnetization behaviour has been observed. The characteristic component could be isolated from 575-620º C up to 680º C, in 74 samples showed both polarities and allowed to define a consistent magnetic zonation. The data presented wil1 contribute to the construction of a standard polarity sea/e for the Triassic time span.

Peer reviewed