Biostratigraphy and paleobiogeography of the archaeocyaths on the southwestern margin of Gondwana

Perejón, Antonio; Moreno-Eirís, Elena

doi:10.1127/1860-1804/2006/0157-0611

Cited by 15 publications

(22 citation statements)

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“…This species, typical of the Ovetian Stage ( Bigotina bivallata zone), was later found to be recorded below Lemdadella linaresae Liñán Guijarro, 1978 in the Sierra de Córdoba mountain range of southern Spain, but still coexisted for a short time with the latter (Liñán et al . 2005) within archaeocyathan Zone III (which was tentatively correlated by Perejón & Moreno-Eiris, 2006 with the lower Atdabanian or A2 of Siberia). The trilobite cf.…”

Section: Age and Correlationmentioning

confidence: 58%

The middle lower Cambrian (Ovetian)Lunagraulosn. gen. from Spain and the oldest trilobite records

2015

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The type material of Agraulos antiquus Sdzuy, 1961 from the La Herrería Formation, northern Spain, is revised together with additional material and included in the new genus Lunagraulos. The stratigraphical range of Lunagraulos antiquus (Sdzuy, 1961) -occurring below that of the trilobite species of the genera Lunolenus, Metadoxides and Dolerolenus in the type locality of Los Barrios de Luna in the province of León, northern Spain -and the accompanying ichnofossil assemblage demonstrate an Ovetian age (lower part of Cambrian Stage 3, currently being discussed by the International Subcommission on Cambrian Stratigraphy) for this species. Moreover, the trilobite Lunagraulos tamamensis n. gen. n. sp. is found in the Tamames Sandstone near the village of La Rinconada in the province of Salamanca, central Spain. The biostratigraphical position of this new taxon and its accompanying ichnoassemblage is also analysed and assigned to the lowermost Ovetian Stage. The genus Lunagraulos is therefore the oldest agraulid found in the fossil record. The exceptional presence of Lunagraulos in a marine coarse siliciclastic succession -a facies rather typical for the ichnofossils Cruziana and Rusophycus, some of the oldest signs of trilobite activity -suggests that first trilobite representatives may have inhabited high-to middle-energy, marine environments. This hypothesis may also explain both the taxonomic and biostratigraphic heterogeneity of the first trilobite genera appearing across the world, due to preservation problems in this type of facies. Comparison of the Lunagraulos biostratigraphy with other coeval Spanish fossil assemblages allows us to propose its intercontinental correlation with the oldest records of currently known trilobites.

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Section: Age and Correlationmentioning

confidence: 58%

The middle lower Cambrian (Ovetian)Lunagraulosn. gen. from Spain and the oldest trilobite records

2015

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“…Abadiella bourgini) and other body fossils in the upper part of the underlying Pusa Formation in the Toledo Mountains. The Ovetian stage has been tentatively correlated to the Atdabanian stage of the Siberian Platform (lIñán et al, 2004;pereJón, 1984;pereJón & moreno-eIrIs, 2006).…”

Section: The Azorejo Formationmentioning

confidence: 99%

Fossils from the Azorejo Formation (Lower Cambrian, Central Iberian Zone) in the Guadiana river section at Picón, Ciudad Real

López-Villalta¹

2019

Boletín

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During the Stage 3 of the Cambrian, several siliciclastic formations were deposited in a shallow platform that would become part of the Iberian Massif, containing abundant trace fossils and the conspicuous ichnospecies Astropolichnus hispanicus, endemic to southwestern Europe during the regional Ovetian stage. The fossil record of these formations has been explored mainly in northern Spain; in southern Spain, the Azorejo Formation (Azorejo Sandstone) is the only unit of this kind, but its paleobiological content has never been described in detail. In this work, the fossil record of the Azorejo Formation is documented from one of its least known outcrops: the Guadiana river section at Picón, Ciudad Real. In this section, the Azorejo Forma- tion contains a diverse trace fossil record for a neritic environment, comprising Agrichnium?, Astropolichnus hispanicus, Belorhaphe, Bergaueria cf. hemispherica, Cochlichnus, Conichnus conicus, Cruziana, Dimorphichnus, Diplichnites, Diplocraterion, Monocraterion, Monomorphichnus bilinearis, Monomorphichnus lineatus, Monomorphichnus lineatus var. giganticus, Palaeophycus, Palaeophycus cf. imbricatus, Planolites, Psammichnites, Rusophycus avalonensis?, Skolithos, Treptichnus pedum, and trace fossils similar to Nereites and Zoophycos. A structure interpreted as the body fossil of a radial organism is also described. Some of these fossils are firstly cited to the Azorejo Formation and the Lower Cambrian of the Iberian Massif. Resumen Durante la Edad 3 del Cámbrico, varias formaciones siliciclásticas fueron depositadas en una plataforma somera que habría de convertirse en parte del Macizo Ibérico, conteniendo abundantes pistas fósiles y la icnoespecie Astropolichnus hispanicus, endémica del sudoeste europeo durante el piso regional Ovetiense. El registro fósil de estas formaciones ha sido explorado principalmente en el norte de España; en el sur, la Formación Azorejo (Areniscas del Azorejo) es la única unidad de este tipo, pero su contenido paleobiológico nunca ha sido descrito en detalle. En este trabajo, el registro fósil de la Formación Azorejo es documentado para uno de sus afloramientos menos conocidos: la sección del río Guadiana en Picón, Ciudad Real. En él la Formación Azorejo contiene variadas pistas fósiles, incluyendo Agrichnium?, Astropolichnus hispanicus, Belorhaphe, Bergaueria cf. hemispherica, Cochlichnus, Conichnus conicus, Cruziana, Dimorphichnus, Diplichnites, Diplocraterion, Monocraterion, Monomorphichnus bilinearis, Monomorphichnus lineatus, Monomorphichnus lineatus var. giganticus, Palaeophycus, Palaeophycus cf. imbricatus, Planolites, Psammichnites, Rusophycus avalonensis?, Skolithos, Treptichnus pedum, una pista similar a Nereites y otra a Zoophycos. Se describe una estructura interpretada como el fósil corporal de un organismo radial. Algunos de estos fósiles se citan por primera vez para las Areniscas del Azorejo y el Cámbrico Inferior del Macizo Ibérico.

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“…) (Liñán et al . ); (2) the base of the archaeocyathan Zone VIII of Perejón () placed at the top of the Sierra Gorda Member (Perejón ; Perejón & Moreno‐Eiris ); and (3) the FAD of Strenuella (Liñán et al . , ), located below the two aforementioned horizons.…”

Section: Biostratigraphical Implicationsmentioning

confidence: 99%

Cambrian trilobites from the Huérmeda Formation (Iberian Chains, north‐east Spain) and the inadequacy of the Marianian Stage

Álvaro

Esteve

Gracia³

et al. 2018

Papers in Palaeontology

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A taxonomic study of the trilobites found in the Marianian parastratotype of the Iberian Chains, north‐east Spain, results in the recognition of the new redlichiid Redlichia isuelaensis sp. nov., the ellipsocephalid Lusatiops ribotanus, and the saukiandids Onaraspis garciae sp. nov., Paulaspis tiergaensis gen. et sp. nov. and Luciaspis matiasi gen. et sp. nov. The diagnosis of the new Subfamily Onaraspininae (Saukiandidae) and its genera takes into account distinct differences in the thorax, which is subdivided into prothorax with spinose and/or macropleural tergites and opistothorax with micropleurid segments. Onaraspis geyeri sp. nov. is erected based on material previously described in Jordan, which was assigned to poorly preserved material of Myopsolenites palmeri from Israel. The temporal correlation of Marianian endemic‐dominant trilobites throughout the Variscan tectonostratigraphic units of the Iberian Peninsula is not supported by acritarchs, archaeocyaths or trilobites. Three diachronous horizons have been proposed to mark the base of the Marianian (based on the first occurrence of two trilobite genera and one archaeocyathan assemblage zone) and two diachronous horizons for the top (based on the first and last occurrence of different trilobite genera). As a result, the Cambrian Epoch‐2 Marianian Stage is ill‐defined and rendered invalid for correlation throughout the Iberian Peninsula.

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Biostratigraphy and paleobiogeography of the archaeocyaths on the southwestern margin of Gondwana

Cited by 15 publications

References 0 publications

The middle lower Cambrian (Ovetian)Lunagraulosn. gen. from Spain and the oldest trilobite records

The middle lower Cambrian (Ovetian)Lunagraulosn. gen. from Spain and the oldest trilobite records

Fossils from the Azorejo Formation (Lower Cambrian, Central Iberian Zone) in the Guadiana river section at Picón, Ciudad Real

Cambrian trilobites from the Huérmeda Formation (Iberian Chains, north‐east Spain) and the inadequacy of the Marianian Stage

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