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

Javier Alvaro, J.; Zamora, Samuel; Vizcaino, Daniel and Ahlberg, Per LU (2013) In Geological Magazine 150(1). p.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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
taphonomy, biogeography, Languedocian, Baltica, Gondwana
in
Geological Magazine
volume
150
issue
1
pages
123 - 142
publisher
Cambridge University Press
external identifiers
  • wos:000311908600007
  • scopus:84870898771
ISSN
0016-7568
DOI
10.1017/S0016756812000416
language
English
LU publication?
yes
id
1ac5cdef-5ae9-4260-94d4-e2a5d25074c4 (old id 3401021)
date added to LUP
2013-01-29 12:17:29
date last changed
2019-04-21 03:18:20
@article{1ac5cdef-5ae9-4260-94d4-e2a5d25074c4,
  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.},
  author       = {Javier Alvaro, J. and Zamora, Samuel and Vizcaino, Daniel and Ahlberg, Per},
  issn         = {0016-7568},
  keyword      = {taphonomy,biogeography,Languedocian,Baltica,Gondwana},
  language     = {eng},
  number       = {1},
  pages        = {123--142},
  publisher    = {Cambridge University Press},
  series       = {Geological Magazine},
  title        = {Guzhangian (mid Cambrian) trilobites from siliceous concretions of the Valtorres Formation, Iberian Chains, NE Spain},
  url          = {http://dx.doi.org/10.1017/S0016756812000416},
  volume       = {150},
  year         = {2013},
}