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Palaeoenvironments, stratigraphy and taphonomy of an Upper Triassic vertebrate-bearing unit, Silves Group, central Algarve, southern Portugal

2026-01-16Artigo científico Acesso aberto
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datacite.subject.sdg15:Proteger a Vida Terrestre
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg04:Educação de Qualidade
dc.contributor.authorRuciński, Maciej
dc.contributor.authorEzquerro Ruiz, Lope
dc.contributor.authorCampos, Hugo
dc.contributor.authorMateus, Octávio
dc.contributor.authorFernandes, Paulo
dc.contributor.authorVilas-Boas, Margarida
dc.contributor.authorAtfy, Haytham El
dc.contributor.authorWerneburg, Ingmar
dc.date.accessioned2026-06-24T14:15:11Z
dc.date.available2026-06-24T14:15:11Z
dc.date.issued2026-01-16
dc.description.abstractTriassic to Lower Jurassic deposits known as the Silves Group in the Algarve, southernPortugal, have been studied for over 150 years. However, many of this unit’s sedimento-logical, stratigraphical, and palaeontological aspects remain poorly documented. Here, we present novel observations on sedimentology, stratigraphy, taphonomy, and fauna atthe Rocha da Pena site, located in the central part of the Algarve Basin. The investigatedsequence is established to correspond to the upper part of the Silves Group. The mud-stone, calcrete, and palustrine carbonate facies comprise most of the sequence thicknessand are interpreted as having been deposited within coastal alluvial mudflats to palus-trine settings under semi-arid and seasonal climates. The overlying siltstone and sand-stone facies indicate an environmental shift towards tidally influenced environments,subsequently covered by the latest Triassic to earliest Jurassic volcaniclastics and basalticlava flows. Furthermore, novel faunal elements, including actinopterygian and union-oid bivalves, are described from mudstone layers. New fossiliferous beds are identifiedwithin palustrine facies that yield numerous but poorly preserved materials assigned tocyamodontoid placodonts, hybodont sharks, and actinopterygians. The poor preserva-tion of the remains is attributed to the pedogenetic processes prevalent in the palustrinedepositional setting. A distinct faunal composition between the mudstone and palustrinefacies is observed. It is preliminarily hypothesized to be likely linked with salinity fluctu-ations, but sampling bias cannot currently be excluded. The recovered vertebrate faunaaligns most closely with the Carnian and, to a lesser extent, the Norian fossil record.Nonetheless, the precise age of the fossil-bearing levels remains uncertain and can cur-rently be reliably constrained to the upper Carnian–Rhaetian interval. Consequently,this work provides new insights into the palaeoenvironmental evolution of the westernTethys margin during the Late Triassic and highlights the relevance of the Silves Groupin reconstructing coastal-continental ecosystem dynamics in southwestern Iberia.eng
dc.identifier.doi10.18261/let.59.3.3
dc.identifier.eissn1502-3931
dc.identifier.issn0024-1164
dc.identifier.urihttp://hdl.handle.net/10400.1/29140
dc.language.isoeng
dc.peerreviewedyes
dc.publisherScandinavian University Press
dc.relationGeoBioSciences, GeoTechnologies and GeoEngineering
dc.relation.ispartofLethaia
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectTriassic-Jurassic palaeoenvironments
dc.subjectSedimentology
dc.subjectTaphonomy
dc.subjectVertebrates
dc.subjectPortugal
dc.titlePalaeoenvironments, stratigraphy and taphonomy of an Upper Triassic vertebrate-bearing unit, Silves Group, central Algarve, southern Portugaleng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberUID/GEO/04035/2019
oaire.awardTitleGeoBioSciences, GeoTechnologies and GeoEngineering
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FGEO%2F04035%2F2019/PT
oaire.citation.issue3
oaire.citation.titleLethaia: An International Journal of Palaeontology and Stratigraphy
oaire.citation.volume59
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameFernandes
person.givenNamePaulo
person.identifier422469
person.identifier.ciencia-id051D-A133-65D9
person.identifier.orcid0000-0003-4888-0230
person.identifier.ridJ-6577-2014
person.identifier.scopus-author-id57197129025
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublicationa2d98df3-a9c2-4364-a737-25b4e89df80b
relation.isAuthorOfPublication.latestForDiscoverya2d98df3-a9c2-4364-a737-25b4e89df80b
relation.isProjectOfPublicationf678594a-14bd-477b-bb10-171e028dd02c
relation.isProjectOfPublication.latestForDiscoveryf678594a-14bd-477b-bb10-171e028dd02c

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