Research paper
Biostratigraphy of the Ribota and Huérmeda formations (Cambrian Series 2) in the Comarca del Aranda (Zaragoza province), Iberian Chains (NE Spain)
ALEXANDRE SEPÚLVEDA
Departamento de Botánica y Geología, Universitat de València, C/ Dr. Moliner 50, E-46100 Burjassot, Spain. aseba@alumni.uv.es
Corresponding author
ELADIO LIÑÁN
Departamento de Ciencias de la Tierra-IUCA, Universidad de Zaragoza, E-50009 Zaragoza, Spain. linan@unizar.es
JUAN B. CHIRIVELLA-MARTORELL
Grupo de Biología Evolutiva, Facultad de Ciencias, UNED, Paseo Senda Del Rey, 9, 28040 Madrid, SpaDepartamento de Botánica y Geología, Universitat de València, C/ Dr. Moliner 50, E-46100 Burjassot, Spain. juamar@iesorriols.com
JOSÉ ANTONIO GÁMEZ VINTANED
Departamento de Ciencias de la Tierra-IUCA, Universidad de Zaragoza, E-50009 Zaragoza, Spain. gamezv@gmail.com
RODOLFO GOZALO
Departamento de Botánica y Geología, Universitat de València, C/ Dr. Moliner 50, E-46100 Burjassot, Spain. rodolfo.gozalo@uv.es
ABSTRACT
This article presents a detailed biostratigraphic analysis of the Cambrian Series 2 Ribota and Huérmeda formations of four sections of the Iberian Chains (NE Spain), and a systematic study of their trilobite faunas. We identified four major assemblages: two in the middle part of the Ribota Formation, one at the base of the Huérmeda Formation and one at the top of the Huérmeda Formation. The studied species permit the assignment of these formations to the middle and upper Marianian and probably lower Bilbilian stages in the regional stratigraphic chart for the Iberian Peninsula, which correlates with an interval around the Cambrian Stage 3–4 boundary. The assemblages exhibit a great correlation potential with the presence of Termierella and the first figured material of Andalusiana from the Iberian Chains, two characteristic taxa of the Marianian of the Ossa-Morena Zone, having been also recorded from the Central Iberian Zone and Morocco. In addition, specimens tentatively assigned to Hebediscus are recorded for the fi rst time from the region, a taxon with a wide geographic distribution which allows a good international correlation in the Cambrian Series 2.
Key words: Trilobites, Biostratigraphy, Systematic palaeontology, Marianian, Bilbilian, Iberian Chains.
How to cite: Sepúlveda, A., Liñán, E., Chirivella-Martorell, J.B., Gámez Vintaned, J.A., & Gozalo, R. 2022. Biostratigraphy of the Ribota and Huérmeda formations (Cambrian Series 2) in the Comarca del Aranda (Zaragoza province), Iberian Chains (NE Spain). Spanish Journal of Palaeontology, 37(1), 101-122.
ReceReceived 16 Januray 2022, Accepted 18 May 2022, Published online 1 June 2022
https://doi.org/10.7203/sjp.24492
