RT Journal Article
T1 Advances in the Lower Ordovician of the western Iberian Chain, NE Spain
A1 Álvaro, J.J.
AB The western Iberian Chain of NE Spain represents a lateral prolongation of the West Asturian-Leonese Zone. As other proximal sectors fringing NW Gondwana, the chain comprises a con­formable and continuous Furongian‒Tremadocian transition, comprising a thick (3600‒4500 m) Lower Ordovician sedimentary succession, exclusively composed of siliciclastic strata and deposited in mid-latitude (temperate) waters. Although the shelly fossil record is not abundant, some key trilobites and brachiopods allow the identification of distinct biogeographic links with the Argentinian margin of West Gondwana, Oaxaca (Mexico), and the neighbouring Montagne Noire (France), with which a common biostratigraphic biozonation can be enviaged. Two phosphoritic interbeds rich in linguliformean brachiopods punctuate the Valconchán and Borrachón formations, and represent event beds related to condensation processes and sedimentation of explosive ignimbritic tuffs, respectively.
PB Estonian Academy of Sciences
SN 1736-4728
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/109112
UL https://hdl.handle.net/20.500.14352/109112
LA eng
NO Álvaro, J. J. and Martínez-Benítez, B. 2023. Advances in the Lower Ordovician of the western Iberian Chain, NE Spain. Estonian Journal of Earth Sciences, 72(1), 6–9. https://doi.org/10.3176/earth.2023.15
NO Ministerio de Ciencia e Innovación
NO Estonian Academy of Sciences
DS Docta Complutense
RD 14 jun 2025