Late Ordovician to Early Silurian Conodont Faunas From the Kolyma Terrane, Omulev Mountains, Northeast Russia, and Their Paleobiogeographic Affinity

Zhang, Shunxin; Barnes, Christopher R.

doi:10.1666/05077.1

Cited by 26 publications

(33 citation statements)

References 22 publications

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“…Conodont associations identified in this interval are poor to very poor, and conodonts are almost missing in the Hirnantian (Zhang & Barnes 2007, see also our data below). Chitinozoans, except rare poorly preserved fragments, were not found.…”

Section: Introductionsupporting

confidence: 53%

“…4). Scarcity of conodonts in the Mirny Creek section was demonstrated also by Zhang & Barnes (2007). All other groups are represented as a rule by single elements or fragments per sample, e.g.…”

Section: Microfossil Abundance and Diversitymentioning

confidence: 81%

“…The scheme is based on Koren′ et al (1983) with modifications according to Koren′ & Sobolevskaya (2008) and Zhang & Barnes (2007). general biozonal framework for the Mirny Creek section and correspondingly enabling also the time correlation with global standard stratigraphy (Koren′ & Sobolevskaya 2008). Figure 2 presents the local and other stratigraphical terminology used in the paper.…”

Section: Fig 2 Stratigraphy Of the Upper Ordovician And Lowermostmentioning

confidence: 99%

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More about the Ordovician–Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts

Kaljo¹,

Männik²,

Martma³

et al. 2012

Estonian J. Earth Sci.

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Profound environmental and biodiversity changes take place in the Ordovician–Silurian boundary interval. The Mirny Creek and Neznakomka River bank sections discussed in this paper expose the upper Katian–lower Rhuddanian part of the boundary beds. The succession consists of carbonate rocks, partly with bioherms, alternating with argillaceous and siltstone packages that are well dated by graptolites. Microfossils are rare, especially in the Hirnantian, but conodonts provide some useful markers just below and above the Hirnantian stage boundaries. The Hirnantian δ13C trend in the Mirny Creek section is the stratigraphically longest described so far and it has a highly specific shape. The trend commenced at the first appearance datum of Normalograptus extraordinarius or slightly below this level. The main peak occurs near the middle of the N. persculptus Biozone. Samples from the Neznakomka River suggest a somewhat wider peak interval than at Mirny Creek. Detailed comparison of the Mirny and Stirnas (Latvia) δ13C curves shows a general similarity despite great specific features of both trends. Correlation of the δ13C trends from China, Baltica and North America with that at Mirny Creek reveals a great variety of shapes of the carbon isotope curve. However, its rising limb commenced, if represented, everywhere close to the beginning of the N. extraordinarius Biozone or in terms of the Baltic succession, at the bottom of the Porkuni Regional Stage. Most likely a general shape of the HICE trend is pyramidal, which is peaking in the early N. persculptus Biochrone. Differences in the values and shape of an actual curve at different localities depend on local environmental conditions, sometimes modifying the global signal rather strongly

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Section: Introductionsupporting

confidence: 53%

Section: Microfossil Abundance and Diversitymentioning

confidence: 81%

Section: Fig 2 Stratigraphy Of the Upper Ordovician And Lowermostmentioning

confidence: 99%

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More about the Ordovician–Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts

Kaljo¹,

Männik²,

Martma³

et al. 2012

Estonian J. Earth Sci.

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“…The fossil occurrences of Hypodicranotus are known from North America, the United Kingdom, the Ural Mountains of Siberia and Kolyma of eastern Russia (Ludvigsen & Chatterton 1991). The palaeogeographic position of the Kolyma Terrain during the Ordovician appears to be the Mediterranean Province, possibly near Laurentia (Zhang & Barnes 2007, Rasmussen & Harper 2011. In contrast to the case of Hypodicranotus, the genus Remopleurides likely had a broad distribution (Amati et al 2009) even for supposed propulsion-efficient swimmers.…”

Section: Fossil Evidence and Relevant Sedimentary Environmentmentioning

confidence: 99%

Pelagic or benthic? Mode of life of the remopleuridid trilobite Hypodicranotus striatulus

Shiino¹,

Kuwazuru²,

Suzuki³

et al. 2014

Bull. Geosci.

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The mode of life of the remopleuridid trilobite Hypodicranotus striatulus Walcott (1875) was examined hydrodynamically with a special focus on the relationship between the autecological performances of swimming and feeding. To understand the effect of swimming height from the sea bottom on the hydrodynamic performance of the exoskeleton, we performed computational fluid dynamics simulations on four models at differing distances from the sea bottom. The results indicated that Hypodicranotus could launch itself from the sea bottom with a relatively strong hydrodynamic lift force from slow walking or swimming speeds. However, the lift force decreased as the swimming height increased at slow swimming speeds. Hence, Hypodicranotus would have had to increase its swimming speed to greater than 0.2 m/s and to obtain the most stable lift force at a swimming height equal to half of its own body height. Its exoskeletal morphology, with a forked hypostome, enabled it to launch itself at a slow velocity and swim at a modest distance, i.e., close to its own height, from the sea bottom. Feeding from the median vortex flows along the food groove between the two prongs of the hypostome may have been the best strategy near the sea bottom, where a large amount of food matter would have been available. Because arthropod musculature consists of striated muscles, which exhibit inferior endurance, Hypodicranotus most likely adapted to the near-bottom environment, where it could rest at times on the sea bottom as part of a nektobenthic mode of life.•

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“…Recently conodonts from the Mirny Creek and Ina River sections were described (Zhang & Barnes 2007). The faunal record within unit Q proved to be very scarce in spite of close sampling, however, the zonal species Amorphognathus ordovicicus Branson & Mehl was found in the lower part of unit Q (Zhang & Barnes 2007, fig.…”

Section: Correlationmentioning

confidence: 99%

The regional stratotype section and point for the base of the Hirnantian Stage (the uppermost Ordovician) at Mirny Creek, Omulev Mountains, Northeast Russia

Korena¹,

Sobolevskaya²

2008

Estonian Journal of Earth Sciences

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A complete Hirnantian sequence comprising the Normalograptus extraordinarius and N. persculptus biozones is well developed at the Mirny Creek section in the Omulev Mountains. The underlying beds are assigned to the Appendispinograptus supernus Biozone, and in the overlying strata the lower boundary of the Silurian is precisely defined at the base of the Akidograptus ascensus Biozone. Due to the completeness of the sedimentary and palaeontological record, the Mirny Creek section can be considered as a reference section for the Hirnantian Stage. The succession, about 100 m thick, is composed of calcareous siltstones and marls with pebble-shaped limestones, deposited at a high sedimentation rate in shallow shelf settings. The regional stratotype section and point (RSSP) for the lower boundary of the Hirnantian is established at the base of member 68, where Normalograptus extraordinarius first appears. This level can be precisely correlated with that at the GSSP section in Yichang and with the sections in Kazakhstan and North America. The position of the Ordovician-Silurian boundary is redefined and placed at the FAD of A. ascensus at the base of member 74.

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Late Ordovician to Early Silurian Conodont Faunas From the Kolyma Terrane, Omulev Mountains, Northeast Russia, and Their Paleobiogeographic Affinity

Cited by 26 publications

References 22 publications

More about the Ordovician–Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts

More about the Ordovician–Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts

Pelagic or benthic? Mode of life of the remopleuridid trilobite Hypodicranotus striatulus

The regional stratotype section and point for the base of the Hirnantian Stage (the uppermost Ordovician) at Mirny Creek, Omulev Mountains, Northeast Russia

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