2026-06-07T16:54:13Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/1091122025-03-18T12:12:25Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Álvaro, J.J. 2024-10-18T15:49:44Z 2024-10-18T15:49:44Z 2023 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 1736-4728 10.3176/earth.2023.15 https://hdl.handle.net/20.500.14352/109112 1736-7557 https://doi.org/10.3176/earth.2023.15 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. eng Attribution 4.0 International Advances in the Lower Ordovician of the western Iberian Chain, NE Spain journal article 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URL https://docta.ucm.es/bitstreams/9a490fe8-9f4d-48a7-8c8f-f204f3aa9e63/download File MD5 bb002dea76b549669176c405f3e1d428 5204885 application/pdf Advances in the Lower Ordovician.pdf URL https://docta.ucm.es/bitstreams/5730ce9d-cb4e-4aae-bf19-0d60eed5349c/download File MD5 5073d7fc4e07234d0f3c73405e622d0a 18293 text/plain Advances in the Lower Ordovician.pdf.txt