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GEOREF RECORD

Guzhangian (mid-Cambrian) trilobites from siliceous concretions of the Valtorres Formation, Iberian Chains, NE Spain

J. Javier Alvaro, Samuel Zamora, Daniel Vizcaino and Per Ahlberg
Guzhangian (mid-Cambrian) trilobites from siliceous concretions of the Valtorres Formation, Iberian Chains, NE Spain
Geological Magazine (January 2013) 150 (1): 123-142

Abstract

In the carbonate-siliciclastic strata of West Gondwana (e.g. in the Montagne Noire, France), the aftermath of the mid Languedocian (mid Cambrian) regression is characterized by a late Languedocian major turnover of trilobite families and a Furongian-early Tremadocian radiation related to the stepwise immigration of trilobite invaders from East Gondwana under persistent transgressive conditions. The scarcity of upper Languedocian fossil accumulations in clayey substrates has inspired the sampling of the palaeogeographically most distal parts of the Iberian Chains (Spain), where diagenetic dissolution of ubiquitous hexactinellid sponge spicules has favoured the formation of siliceous concretions. These have yielded the trilobites Peronopsis cf. insignis, Oidalagnostus trispinifer, Proampyx difformis (= Proampyx aculeatus), Bailiaspis? glabrata (= Holocephalina agrauloides, by ontogeny), Holasaphus cf. centropyge and a paradoxidid gen. et sp. indet. Despite preservation and sampling biases, the identification of this taphonomic window in offshore clayey substrates of West Gondwana allows the recognition of a strong biogeographical link with Baltica, and the correlation of the global Guzhangian Stage and the Solenopleura? brachymetopa Zone of Scandinavia with part of the Mediterranean upper Languedocian Substage.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 150
Serial Issue: 1
Title: Guzhangian (mid-Cambrian) trilobites from siliceous concretions of the Valtorres Formation, Iberian Chains, NE Spain
Affiliation: Instituto Nacional de Tecnica Aeroespacial, Centre of Astrobiology, Torrejon de Ardoz, Spain
Pages: 123-142
Published: 201301
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 117
Accession Number: 2013-021018
Categories: Invertebrate paleontologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N39°40'00" - N42°30'00", W03°40'00" - W00°19'60"
Secondary Affiliation: Natural History Museum, GBR, United KingdomLund University, SWE, Sweden
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201314
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