@article{10272/24316,
year = {2024},
month = {9},
url = {https://hdl.handle.net/10272/24316},
abstract = {The Cambrian outcrops within the Zafra-Alanís Domain, southwest Iberia contain the type localities of several trilobite genera, including Alanisia, Saukianda, Perrector, Eops, Andalusiana, Protaldonia, and nine trilobite species. These fossils are attributed to the Marianian regional Stage, spanning from the upper Stage 3 to the lower Stage 4 of Cambrian Series	2.	Despite	their	significance,	the	biostratigraphy	of	these	outcrops	has	remained	understudied	due	to	the	scarcity	of	continuous stratigraphic sections and the lack of comprehensive biostratigraphic research in this region. In this work, we present	a	refined	trilobite	biostratigraphic	framework	by	examining	ten	newly	established	stratigraphic	sections	bearing	trilobite	fossils	of	the	Zafra-Alanís	Domain,	on	the	Northern	flank	of	the	Olivenza-Monesterio	Antiform,	spanning	across	the Badajoz and Seville provinces. This framework constitutes the foundation for future zonation of the Marianian Stage and contributes to a more precise understanding for international correlation. The Cambrian tectonosedimentary blocks of	the	Ossa-Morena	Zone,	formed	due	to	the	rifting	process	in	southwestern	Iberia	during	Cambrian	times,	extend	into	southwestern Spain and eastern Portugal. A revised delineation of these blocks has been carried out, including a new outline	of	the	Feria	Fault,	now	identified	as	the	Guadalcanal-Assumar	Fault.	In	addition,	the	stratigraphic	and	palaeontological	analysis	of	the	Cambrian	outcrops	in	the	Seville	province	(Sierra	Morena	de	Sevilla	Natural	Park	-	UNESCO	Global	Geopark)	allows	their	inclusion	within	the	recently	defined	Viar-Benalija	basin},
abstract = {Los	afloramientos	del	Dominio	Zafra-Alanís,	suroeste	de	Iberia,	contienen	las	localidades	tipo	de	varios	géneros	de	trilobites: Alanisia, Saukianda, Perrector, Eops, Andalusiana, Protaldonia, y de nueve especies de trilobites. Estos fósiles son característicos del piso Marianiense, en la escala regional, que abarcaría desde la parte superior del Piso 3 hasta la inferior	del	Piso	4	de	la	Serie	2	del	Cámbrico.	A	pesar	de	la	importancia	paleontológica	de	estos	afloramientos,	el	estudio	detallado	de	los	mismos	ha	sido	escaso,	debido	a	la	falta	de	secciones	estratigráficas	continuas	y	de	un	análisis	bioestratigráfico	exhaustivo	en	la	región.	En	este	trabajo	se	presenta	una	bioestratigrafía	detallada,	a	partir	de	los	datos	de	diez	secciones	con	trilobites	situadas	en	el	Dominio	de	Zafra-Alanís,	en	el	flanco	norte	del	Antiforme	de	Olivenza-Monesterio,	en las provincias de Badajoz y Sevilla. Este marco de trabajo es la base para el establecimiento de una detallada zonación con trilobites del Piso Marianiense que, además, contribuirá a una correlación internacional más precisa. Las cubetas tectonosedimentarias	de	la	Zona	de	Ossa-Morena,	formadas	durante	la	etapa	de	rifting en el suroeste de Iberia durante el Cámbrico, se extienden por el suroeste de España y este de Portugal. Se revisan los límites de estas cubetas, destacando la delimitación	más	precisa	de	la	falla	de	Feria,	ahora	identificada	como	la	falla	de	Guadalcanal-Assumar.	Además,	el	análisis	estratigráfico	y	paleontológico	de	los	afloramientos	cámbricos	de	la	provincia	de	Sevilla	(Parque	Natural	Sierra	Morena	de	Sevilla	-	Geoparque	Global	UNESCO),	permite	su	inclusión	dentro	de	la	cubeta	de	Viar-Benalija,	recientemente	definida},
organization = {This work is a tribute to Dr Teodoro Palacios for his work in the study of the Precambrian and Cambrian of the Iberian Peninsula. He also regularly collaborated with us in the MAGNA Project (IGME) sampling many of the localities studied here. We thank Sören Jensen (Extremadura University, UNEX) for inviting us to participate in the tribute to Teodoro Palacios in Badajoz and for improving the original manuscript as well as to James Holmes (Uppsala University)	and	two	anonymous	referees.	Thanks	to	Isabel	Pérez	Urresti,	who assisted us with fossil photography. In 1982, EL and Teodoro Palacios (TP) visited the Cambrian outcrops in Alentejo to sample their respective successions, with assistance of Francisco Gonçalves from the University of Évora. EL and TP took part in the teams on the sheets 898-Puebla de Maestre (Apalategui Isasa et al. 1990) and 899-Guadalcanal (Apalategui Isasa et al. 1983) in 1980 and 1983, respectively. In 1996, EL, TP and RG explored the Cambrian sections of	the	OMZ	in	Portugal,	receiving	geological	guidance	from	Manuel	Francisco Pereira and Luis Lopes of the Évora University, to whom we	are	grateful.	The	present	work	has	been	carried	out	with	financial	help from Junta de Andalucía to the RNM 276 Research Group and the Centro	Científico-Tecnológico	de	Huelva	(CCTH).	LC	is	supported	by Portuguese fund by Fundação para a Ciência e a Tecnologia (Portugal) in the frame of the UI/DB/151298/2021 project. The cited and depicted trilobite material is held in the Museo de Ciencias Naturales of the Zaragoza University (MPZ 2023/272–284; MPZ 2022/770–799; MPZ2022/817–830 and MPZ 2022/840–859
Open Access funding provided thanks to the	CRUE-CSIC agreement with Springer Nature},
publisher = {Springer},
title = {Trilobite biostratigraphy of the Marianian (Cambrian Series 2) from Seville and Badajoz provinces (Zafra-Alanís Domain, Ossa-Morena Zone, Spain): a review},
doi = {10.1007/s41513-024-00247-9},
author = {Liñán Guijarro, Eladio and Collantes Ruiz, Luis and Mayoral Alfaro, Eduardo and Gozalo, Rodolfo},
}