Craspedites (Vitaliites?) sachsi, a New Boreal Berriasian ammonite species of the North of Eastern Siberia (Nordvik Peninsula)

Igolnikov, A. E.

doi:10.1134/s0031030112010066

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…chetae. Igolnikov (2010) noted a similar absence of ammonites through the majority of the Kochi Zone. No doubt more finds will certainly be made, but currently at Nordvik the bases of the magnetozones which have been identified -M19r, M19n, M18r, M17r and M16r -all fall (Bragin et al 2013) in intervals with no ammonites.…”

Section: Nordvik Ammonite Recordmentioning

confidence: 83%

A review of magnetostratigraphic results from the Tithonian–Berriasian of Nordvik (Siberia) and possible biostratigraphic constraints

Schnabl¹,

Pruner²,

Wimbledon³

2015

Geologica Carpathica

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Abstract:In this contribution we examine and discuss recently published magnetostratigraphic data from the Nordvik section (north Siberia) around the Tithonian-Berriasian (J/K) boundary, with a special emphasis on calibration with biostratigraphy and the reliability of both the fossil and magnetic records, as well as sedimentation rates. Specifically, we discuss original new interpretations by Bragin et al. (2013) and the commentary on that work by Guzhikov (2013). We consider some limitations of the Nordvik section, and conclude that the base of M18r, because it is in a condensed part of the sequence, makes a poor contender for precise long-range correlation. We discuss the lack of ammonites at several magnetozone boundaries, and whether the bases of the local zones of Craspedites taimyrensis and Arctoteuthis tehamaensis can be used to bracket the correlative horizon of Calpionella alpina, a widespread marker in the middle of M19n.2n in Tethys.

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Section: Nordvik Ammonite Recordmentioning

confidence: 83%

A review of magnetostratigraphic results from the Tithonian–Berriasian of Nordvik (Siberia) and possible biostratigraphic constraints

Schnabl¹,

Pruner²,

Wimbledon³

2015

Geologica Carpathica

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“…Surites occurs in abundance in northern and western Siberia (e.g. Shul’gina, 1975, 1985; Vyachkileva et al, 1990; Igolnikov, 2019), the Russian Platform (e.g. Sazonova, 1977; Mitta, 2017), East Greenland (Alsen, 2006), Spitsbergen (Ershova, 1983) and Franz-Josef Land (Dibner & Shulgina, 1998).…”

Section: Resultsmentioning

confidence: 99%

“…( Runctonia ) co-occurs with Chetaites sibiricus , a typical lowermost Ryazanian species. The ammonite assemblage of the Runctoni Zone of NW Europe also includes Praesurites (considered a junior synonym of Praetollia by Igolnikov, 2019), an ammonite genus whose first occurrence marks the base of the Ryazanian in the Subpolar Urals (Casey et al, 1988). The lower and upper boundaries of the Runctoni Zone can be traced throughout the Boreal areas, defined by first and last occurrences of distinct common and short-ranging ammonite genera.…”

Section: Resultsmentioning

confidence: 99%

“…Until recently, the youngest records of the ammonite genus Praetollia were reported from the Kochi Zone (cf. Abbink et al, 2001b, p. 285; Rogov et al, 2011; Igolnikov, 2019, p. 42–43, 121). However, the occurrence of Lynnia below and above our record of Praetollia suggests Praetollia to range into at least the lower part of the Icenii Zone.…”

Section: Macrofossilsmentioning

confidence: 99%

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Ryazanian (Berriasian) molluscs and biostratigraphy of the Dutch and Norwegian North Sea area (south of Viking Graben)

Janssen

Rogov

Захаров

2022

Netherlands Journal of Geosciences

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Herein, Ryazanian (Berriasian) macrofossils from three well cores in the Central Graben (wells B18-02, L06-02, The Netherlands) and on the Jæren High (well 7/7-2, Norway) in the southern North Sea region are described. Macrofossils are mainly represented by buchiid bivalves (Buchia volgensis) and ammonites (Surites, Lynnia and Praetollia?). The genus Lynnia is recorded for the first time outside its topotypical area, and its systematic position and stratigraphic ranges are discussed. Additionally, the studied core sections yielded coleoid remains and a single limid bivalve. Based on the stratigraphic ranges of key ammonite genera (Lynnia, Surites and Bojarkia), the zonation of the Ryazanian stage is reconsidered. Uppermost Volgian to Ryazanian ammonite faunas are quite consistent and diverse but showing a higher degree of similarity throughout the Panboreal Superrealm as compared to those from rest of the Upper Volgian and the Middle Volgian. Buchia volgensis is the only species known from the southern North Sea and East Anglia, which is in strong contrast to the high diversity of Buchia in East Greenland and the remainder of the Boreal Realm. We hypothesise that such differences in the distribution of ammonites and bivalves in general, and the absence of buchiid species other than Buchia volgensis south of East Greenland in particular, are the result of anoxic bottom water conditions in the southern Viking Strait. The unusually wide geographic range of B. volgensis, which is known from such distant areas as Mexico and the Crimea, suggests a potential higher tolerance of this species to adverse conditions.

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Pseudoinversion of septal sutures in Middle Jurassic–Lower Cretaceous non-heteromorph ammonites

Rogov

2019

Swiss J Palaeontol

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New records of ammonites showing poorly known sutural anomaly, so-called sutural pseudoinversion, are discussed. For the first time, sutural pseudoinversion was found in non-heteromorph Jurassic and Lower Cretaceous ammonoids, which are belonging to 10 genera (Dorsetensia, Indosphinctes, Erymnoceras, Pictonia, Aspidoceras, Kachpurites, Craspedites, Delphinites, Nikitinoceras and Immunitoceras) and 8 families (Sonniniidae, Pseudoperisphinctidae, Pachyceratidae, Aulacostephanidae, Aspidoceratidae, Craspeditidae, Neocomitidae and Parahoplitidae). Two types of sutural pseudoinversion were recognized: normal sutural pseudoinversion, in which the outline of small elements in lobes and saddles is fully reversed, and transitional sutural pseudoinversion, characterized by changes in the outline of folioles only. Usually, sutural pseudoinversion occurs in the terminal part of the phragmocone and becomes especially clear on the last sutures near the body chamber, but in some studied specimens sutural pseudoinversion appears in middle whorls and can be traced further up to the last visible sutures. Sutural pseudoinversion could not be caused by mechanical compression of saddles due to sutural asymmetry or strong development of sculptural elements as Bayer (Lethaia 11:307-313, 1978) assumed. Pseudoinversion is usually (although not always) visible in all sutural elements. Although pseudoinversion is known in those taxa with strong sutural asymmetry, pseudoinversion and asymmetry often affected different specimens. Influence of hydrostatic overpressure during the septal formation as well as parasite infestation on development of sutural pseudoinversion is considered to be unlikely. Instead, an abnormality appears to be a case of homeotic mutation, possibly caused by transcription errors in polarity genes. Much more common occurrence of sutural pseudoinversion in ammonites than it was expected previously suggest that it could be a relatively common phenomenon that needs increased attention in the future.

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Craspedites (Vitaliites?) sachsi, a New Boreal Berriasian ammonite species of the North of Eastern Siberia (Nordvik Peninsula)

Abstract: A new species Craspedites (Vitaliites?) sachsi sp. nov. is described from the Boreal Berriasian of the North of Eastern Siberia.

Cited by 4 publications

References 2 publications

A review of magnetostratigraphic results from the Tithonian–Berriasian of Nordvik (Siberia) and possible biostratigraphic constraints

A review of magnetostratigraphic results from the Tithonian–Berriasian of Nordvik (Siberia) and possible biostratigraphic constraints

Ryazanian (Berriasian) molluscs and biostratigraphy of the Dutch and Norwegian North Sea area (south of Viking Graben)

Pseudoinversion of septal sutures in Middle Jurassic–Lower Cretaceous non-heteromorph ammonites

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