Palaeobiogeographical significance of Early Silurian thelodonts from central Asia and southern Siberia

Žigaitė, Živilė; Blieck, Alain

doi:10.1080/11035890601282203

Cited by 9 publications

(17 citation statements)

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“…sibirica Zone in the Middle-Upper Llandovery interval in the first standard scheme, is hereby excluded from the scheme for two reasons. First, the total range of L. sibirica (= L. sibirica Zone) in the Siberian Platform corresponds to the entire Llandovery (Žigaitė & Blieck 2006) and therefore cannot be treated as coeval with the L. scotica Zone. Second, the interval is a single separate 'hanging' interval and does not have any vertebrate zones above or below it.…”

Section: Remarksmentioning

confidence: 99%

Revision of Silurian vertebrate biozones and their correlation with the conodont succession

Märss¹,

Männik²

2013

Estonian J. Earth Sci.

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The first vertebrate-based subdivisions of Silurian strata were mainly drawn on material from outcrops in Britain and drill cores from the southern Baltic. Nearly twenty years ago the first vertebrate biozonal scheme was developed on the basis of vertebrate distribution in several continuous drill core sections in the northern Baltic. This paper presents a new scheme in which many new data on vertebrate distribution from the Baltica (Baltic region, NW Russia), Avalonia (southern Britain, eastern Canada), Laurentia (northern Canada, Greenland, Scotland) and Kara (Arctic Russia) palaeocontinents have been used. All the zones have been defined, and the geographical distribution and the reference stratum and locality for each zone have been given. The Llandovery part of the succession contains the Valyalepis crista, Loganellia aldridgei and L. scotica zones; the Wenlock part is represented by the Archipelepis bifurcata/Arch. turbinata, L. grossi, Overia adraini, L. einari and Paralogania martinssoni zones. The Par. martinssoni Zone continues in the Ludlow and is followed by the Phlebolepis ornata, Phl. elegans, Andreolepis hedei, Thelodus sculptilis and T. admirabilis zones. The last zone continues in the lower Přidoli and is followed by the Nostolepis gracilis, Poracanthodes punctatus and Trimerolepis timanica zones. The L. aldridgei and Arch. bifurcata zones are new, and the Arch. turbinata and O. adraini faunas have been raised from ‘faunal succession units’ to zones. The geographically widely distributed L. grossi Zone in the upper Sheinwoodian and the Par. martinssoni Zone in the upper Homerian–lowermost Gorstian allow the integration of regional successions into one Generalized Vertebrate Zonal Scheme. Possible correlations of conodont and vertebrate biozones, and gaps in sedimentation in the northern East Baltic Silurian sequence have been discussed, the most extensive hiatus being between the Paadla and Kuressaare stages

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Section: Remarksmentioning

confidence: 99%

Revision of Silurian vertebrate biozones and their correlation with the conodont succession

Märss¹,

Männik²

2013

Estonian J. Earth Sci.

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“…L. tuvaensis from North Greenland could be the same species as L. tuvaensis from central Tuva (excluding a few scales, described by Blom (1999), see synonymy above). This provides evidence for a possible close relationship between the Siberian and Laurentian palaebiogeographical provinces during the Late Silurian (Ž igaitė & Blieck 2006;Ž igaitė et al 2011).…”

Section: Palaeobiogeographic Contextmentioning

confidence: 87%

“…The overlying Razvilka Formation (upper Llandovery, Telychian) is followed by the Usas Formation (Wenlock-uppermost Gorstian). All four formations yielded the thelodont scales discussed in this work; their biostratigraphic distribution was illustrated by Ž igaitė & Blieck (2006). In addition to the thelodonts, the vertebrate fauna from these sections comprises abundant acanthodian, chondrichthyan, heterostracan and mongolepid microremains (Krataju# tė-Talimaa et al 1990, Krataju# tė-Talimaa & Predtechenskyj 1995Ž igaitė et al 2011).…”

Section: East Siberiamentioning

confidence: 99%

“…cf. L. tuvaensis from the Upper Silurian-Lower Devonian (Pridoli-Lochkovian) of North Greenland, the Halls Grav locality and Monument, Hall Land, Chester Bjerg Formation deserve special attention, as significant evidence of ocean connections (Turner & Peel 1986;Blom 1999;Ž igaitė & Blieck 2006). Morphology and histology of the microremains suggest that L. cf.…”

Section: Palaeobiogeographic Contextmentioning

confidence: 99%

“…The first descriptions of thelodont microremains from the Lower Silurian of Siberia and Tuva were made by V. Karataju# tė-Talimaa, and were published as part of a monograph in Russian (Karataju# tė-Talimaa 1978); later Blieck & Janvier (1993) and Turner (1999) summarised the findings in English. Since that time, no comprehensive description of thelodonts from the region has been made (Karataju# tė-Talimaa 1997; Karataju# tė-Talimaa & Ratanov 2002;Ž igaitė & Blieck, 2006;Ž igaitė et al 2011), although further collecting of vertebrates at the localities continued.…”

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Endemic thelodonts (Vertebrata: Thelodonti) from the Lower Silurian of central Asia and southern Siberia

Žigaitė

2013

Earth and Environmental Science Transactions of the Royal Socie

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New fossil vertebrate microremains from the Lower Silurian of NW Mongolia, Tuva and S Siberia have been discovered, and previous collections of thelodonts (Vertebrata: Thelodonti) from this region re-studied, figured and described, following recent advances in morphology and systematics of thelodont scales. As a result, six thelodont species are described here and attributed to two families and three genera. An emended diagnosis is given for each species. Morpohological scale varieties of each species are revised, and the squamation types are introduced to the species descriptions, resulting in newly grouped morphological sets of scales. The previously monotypic genus Talimaalepis Žigaitė, 2004, is proposed to contain two different species; therefore, two new combinations of morphological scale sets of two species are described for the first time. Both of them show transitional scale structure between the genera Loganellia (family Loganellidae) and Helenolepis (family Phlebolepididae). Two of the thelodont genera, Angaralepis and Talimaalepis, as well as all the six species, are endemic and not known anywhere else in the world. They are accompanied by a variety of other peculiar early vertebrates, such as mongolepids, two endemic genera of acanthodians, and putative galeaspids. This work enhances our knowledge of early Silurian vertebrate diversity, and provides evidence of regional palaeoenvironmental conditions and palaeogeographical relationships of the Siberia and Tuva terranes.

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Siberia, the wandering northern terrane, and its changing geography through the Palaeozoic

Cocks¹,

Torsvik²

2007

Earth-Science Reviews

300

171

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Palaeobiogeographical significance of Early Silurian thelodonts from central Asia and southern Siberia

Cited by 9 publications

References 4 publications

Revision of Silurian vertebrate biozones and their correlation with the conodont succession

Revision of Silurian vertebrate biozones and their correlation with the conodont succession

Endemic thelodonts (Vertebrata: Thelodonti) from the Lower Silurian of central Asia and southern Siberia

Siberia, the wandering northern terrane, and its changing geography through the Palaeozoic

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