A summary and revision of the East Baltic Silurian chitinozoan biozonation

Nestor, Viiu

doi:10.3176/earth.2012.4.05

Cited by 25 publications

(21 citation statements)

References 42 publications

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“…longicollis CtZ in the strata immediately above the unconformity in the Grötlingbo-1 core, together with the occurrence here of Oktavites spiralis indicate that the sedimentary record in the core recommences in the lower part of the O. spiralis GZ. A gap of about similar duration has been recognised earlier in several other sections in the East Baltic (Nestor 2012). The gap in the Grötlingbo-1 core section is far more extensive than in the Ohesaare section (Loydell, Kaljo & Männik 1998), within the same facies belt, where the gap in the succession is from the lower Aeronian through to the lower Telychian Spirograptus turriculatus GZ, in conodont biostratigraphical terminology from the (lower) Asp.?…”

Section: Siluriansupporting

confidence: 64%

Integrated Upper Ordovician–lower Silurian biostratigraphy of the Grötlingbo-1 core section, Sweden

Männik

Loydell

Nestor

et al. 2015

GFF

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The biostratigraphical data obtained from the Grötlingbo-1 core section (southern Gotland, Sweden) enable recognition of most of the regional stages known from the Sandbian (Upper Ordovician) to lower Sheinwoodian (Wenlock, Silurian) interval in the East Baltic. The strata corresponding to the Upper Ordovician Keila-Nabala stages have markedly reduced thicknesses in the Grötlingbo-1 core section. Gaps of considerable duration were recognised in some parts of the section: lithological evidence suggest that only lower part of the Pirgu Stage (corresponds to all or part of the Jonstorp Fm.) is represented in the section; in the Llandovery, strata corresponding to the Aspelundia? fluegeli and Distomodus staurognathoides conodont biozones, and to the Pterospathodus eopennatus Conodont Zone (equivalent to the Conochitina alargada and Eisenackitina dolioliformis chitinozoan zones) are missing. Graptolites from the core indicate that the sedimentary record above the Aeronian to middle Telychian gap recommences in the lower part of the Oktavites spiralis Graptolite Zone. Co-occurrences of conodonts, graptolites and chitinozoans agree with earlier data suggesting correlation between the lower boundaries of the Cyrtograptus lapworthi GZ and Pt. am. amorphognathoides CZ, and between the lower and middle parts of the Ireviken Event and the upper Cyrt. murchisoni GZ. appearance of Fungochitina spinifera in sample JN-12 (421.87-421.93 m) and the occurrence of Armoricochitina reticulifera (Fig. 5: D, E) higher in the section, in the interval 420.45-421.65 m (samples JN-9 to JN-11), correlates this interval with the Fung. spinifera CtZ. The uppermost sample in this set, JN-8 (420.15-420.20 m), comes from a limestone with red spots and did not yield chitinozoans. Above sample JN-8, an interval almost 18 m thick, consisting mainly of red-coloured rocks, was not sampled. The samples above the unsampled strata (samples C-62, C-66, JN-1 to JN-7 from interval 397.60-402.55 m) were either barren or yielded long-ranging, stratigraphically undiagnostic taxa. Silurian 50 species of chitinozoans have been identified in the studied Silurian part of the Grötlingbo-1 core section (Figs 3, 6). The lowermost Silurian sample (C-62: 397.50-397.60 m) was barren. The next two samples (C-63 and C-64 from the interval 396.35-396.92 m) yielded only the long-ranging taxa Cyathochitina campanulaeformis (Fig. 6: A) and Ancyrochitina ancyrea which are known to occur also in the Upper Ordovician. The next samples (C-1 and C-65) from the interval 395.43-395.85 m contained Anc. cf. laevaensis and Plectochitina nodifera, indicating the basal Silurian Anc. laevaensis CtZ for this interval (Nestor 1994, 2012).

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Section: Siluriansupporting

confidence: 64%

Integrated Upper Ordovician–lower Silurian biostratigraphy of the Grötlingbo-1 core section, Sweden

Männik

Loydell

Nestor

et al. 2015

GFF

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“…The recovery of the chitinozoan Angochitina elongata in the Yoshiki Formation enables us to correlate back into classic areas of European Silurian geology (Figure 7). Angochitina elongata is reported to have its (2010), Nestor (1990Nestor ( , 1994Nestor ( , 1997Nestor ( , 2003Nestor ( , 2007Nestor ( , 2008Nestor ( , 2009Nestor ( , 2012, Nestor and Einasto (1997) lowest occurrence in the Middle Elton Formation of the Type Ludlow area in the Anglo-Welsh basin, and its highest local occurrence in the Lower Leintwardine Formation (scanicus to leintwardinensis graptolite biozones, Gorstian and lower Ludfordian) in Sutherland's (1994) monograph of the type region. Steeman et al (2016) also reported the species in more basinal marine facies of the Welsh Basin, in the Long Mountain succession near Welshpool, with a very similar range (scanicus to leintwardinensis).…”

Section: Correlation With the Type Ludlow Seriesmentioning

confidence: 99%

Chitinozoans and scolecodonts from the Silurian and Devonian of Japan

et al. 2019

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Silurian and Devonian chitinozoans and scolecodonts are recorded from strata of the Hida‐Gaien Terrane, central Honshu. Silurian chitinozoans include Eisenackitina, Bursachitina, and the species Angochitina elongata. The latter provides a precise biostratigraphical tie between the Japanese succession and the Type Ludlow Series of the Welsh Borderland, UK, and indicates a Ludlow age (Gorstian or early Ludfordian) for the upper member of the Yoshiki Formation in the Ichinotani Valley. Chitinozoans from other Yoshiki Formation localities contain other specimens of Lagenochitinidae. Scolecodonts are more common than chitinozoans in the palynological residues, but are mostly represented by fragments or minor apparatus elements with a low biostratigraphical value. However, material from the Yoshiki and Fukuji Formations includes several species of Mochtyella as well as representatives of Oenonites, Kettnerites, Lunoprionella, Vistulella? and possibly other placognath taxa. Scolecodonts are also present in the Silurian Middle Member of the Gionyama Formation, Kyushu, including a well‐preserved jaw of Pistoprion, and fragments of putative Kettnerites and Oenonites. These finds of scolecodonts suggest close similarity in assemblages between Paleozoic polychaete faunas of Japanese terranes and those of Baltica‐Laurentia.

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“…14), not mentioned earlier from the region. The latter species was originally also described as a subspecies of C. edjelensis, and is currently used as a late Aeronian zonal index in the Baltic region as well as globally (Verniers et al 1995, Nestor 2012. However, its distinguishing is difficult due to the co-occurrence of very similar and morphologically variable taxa in the same stratigraphic interval (Nestor 1994).…”

Section: Chitinozoansmentioning

confidence: 99%

Llandovery microfossils and microfacies of the Hýskov section, Prague Basin

et al. 2019

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Abstract The lower Silurian strata of the Prague Basin, as well as in many other regions, are primarily represented by black shales, with limited to no record of benthic life. In this paper, we describe an exceptional late Aeronian volcanic-carbonate succession from the Hýskov locality near Beroun, which contains a diverse and well-preserved fossil assemblage and specific microfacies features. The studied section is mostly represented by well-washed, poorly sorted skeletal grainstones, rudstones and floatstones along with volcaniclastic material. The environment is interpreted as agitated, above storm wave base, and with rapid sedimentation and burial. The collection of acid-resistant microfossils includes abundant scolecodonts, conodonts and chitinozoans, of which only the chitinozoans have previously been studied. The scolecodonts recovered represent at least 14 polychaete genera and 20 species. The fauna bears a great similarity to the early Silurian assemblages previously reported from Baltica, and some environmentally sensitive species allow constraining the assemblage to shallow-shelf settings. The recovered conodonts similarly show close affinities to Baltic faunas, and suggest a Rhuddanian – Aeronian age for the studied section. The chitinozoan assemblage, containing at least eight species, is dominated by Conochitina, and most likely belongs to the C. alargada Biozone.

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A summary and revision of the East Baltic Silurian chitinozoan biozonation

Cited by 25 publications

References 42 publications

Integrated Upper Ordovician–lower Silurian biostratigraphy of the Grötlingbo-1 core section, Sweden

Integrated Upper Ordovician–lower Silurian biostratigraphy of the Grötlingbo-1 core section, Sweden

Chitinozoans and scolecodonts from the Silurian and Devonian of Japan

Llandovery microfossils and microfacies of the Hýskov section, Prague Basin

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