Stable isotopic calibration of the earliest skeletal fossil assemblages in eastern Siberia (Precambrian‐Cambrian boundary)
Abstract
Sections from the eastern margin of the Siberian Platform provide important reference sections for stable isotopic correlation of the newly defined Precambrian–Cambrian boundary level since they contain some of the earliest pre‐Tommotian shelly fossil assemblages known, and are amenable to δ 13 C stratigraphy. Stable isotopes are examined from the Dvortsy and Ulakhan–Sulugur sections (River Aldan), where sparse pre‐Tommotian assemblages occur, and from the Uchur River region, where the putative Anabarites trisulcatus and Purella antiqua Zones of the Nemakit–Daldynian Stage are well‐developed. Diagenetic resetting of δ 18 O and δ 13 C must be taken into account when comparing such sections. Simple corrections allow for stable isotopic correlation of basal Nemakit–Daldynian and Tommotian strata across eastern Siberia.
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The oldest such fossils occur at the same level in the upper Anabarites trisulcatus-lower Purella zones of the Nemakit-Daldynian Stage of the southeastern Siberian Platform, correlated with the lowermost part of the rising trend in the lower Cambrian δ13C values, around feature Z of the Siberian δ13C reference scale.
“The oldest such fossils occur at the same level in the upper Anabarites trisulcatus -lower Purella zones of the Nemakit-Daldynian Stage of the southeastern Siberian Platform”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
The earliest confirmed appearance of Chancelloria is represented by articulated sclerites from the Purella Zone of the Nemakit-Daldynian Stage of Siberia and correlated with a trough between Siberian isotopic features Z and I.
“The earliest confirmed appearance of Chancelloria is represented by articulated sclerites from the Purella Zone of the Nemakit-Daldynian Stage of Siberia”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
The first appearances of the majority occurred in beds younger than the Precambrian-Cambrian boundary and the carbon isotope negative anomaly associated with this boundary, but not younger than those with Siberian δ13C feature Z attributed to the upper Anabarites trisulcatus-lower Purella zones of the Nemakit-Daldynian Stage.
“but not younger than those with Siberian δ 13 C feature Z and attributed to the upper Anabarites trisulcatus -lower Purella zones of the NemakitDaldynian Stage”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Sclerites of chancelloriid Chancelloria sp. are reported from the Nemakit-Daldynian level at Gonam.
“Spicules of hexactinellids Protospongia sp. and ?sclerites of chancelloriids Chancelloria sp. are also reported from that level (Gonam; Khomentovsky & Karlova, 1993; projected herein onto the Siberian δ 13 C reference scale in accordance with Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Shelly mollusc Oelandiella sp. first appears in the Nemakit-Daldynian Stage at Mt Konus.
“S2 . Shelly molluscs Oelandiella sp. and Barskovia sp., halwaxiids Purella cristata , Siphogonuchites aff. triangularis , and orthothecid hyoliths Lophotheca socialis (Mt Konus; Khomentovsky, Val'kov & Karlova, 1990; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Halwaxiid Siphogonuchites aff. triangularis first appears in the Nemakit-Daldynian Stage at Mt Konus.
“S2 . Shelly molluscs Oelandiella sp. and Barskovia sp., halwaxiids Purella cristata , Siphogonuchites aff. triangularis , and orthothecid hyoliths Lophotheca socialis (Mt Konus; Khomentovsky, Val'kov & Karlova, 1990; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Shelly mollusc Barskovia sp. first appears in the Nemakit-Daldynian Stage at Mt Konus.
“S2 . Shelly molluscs Oelandiella sp. and Barskovia sp., halwaxiids Purella cristata , Siphogonuchites aff. triangularis , and orthothecid hyoliths Lophotheca socialis (Mt Konus; Khomentovsky, Val'kov & Karlova, 1990; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Halwaxiid Purella cristata first appears in the Nemakit-Daldynian Stage at Mt Konus.
“S2 . Shelly molluscs Oelandiella sp. and Barskovia sp., halwaxiids Purella cristata , Siphogonuchites aff. triangularis , and orthothecid hyoliths Lophotheca socialis (Mt Konus; Khomentovsky, Val'kov & Karlova, 1990; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Orthothecid hyolith Lophotheca socialis first appears in the Nemakit-Daldynian Stage at Mt Konus.
“S2 . Shelly molluscs Oelandiella sp. and Barskovia sp., halwaxiids Purella cristata , Siphogonuchites aff. triangularis , and orthothecid hyoliths Lophotheca socialis (Mt Konus; Khomentovsky, Val'kov & Karlova, 1990; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Sclerites of the protoconodont Protohertzina unguliformis first appear in the Nemakit-Daldynian Stage in Siberia (Nemnekey).
“S1 . Sclerites of protoconodonts Protohertzina anabarica and P . unguliformis (Nemnekey; Khomentovsky & Karlova, 1991, 1993; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Spicules of hexactinellid Protospongia sp. are reported from the Nemakit-Daldynian level at Gonam.
“Spicules of hexactinellids Protospongia sp. and ?sclerites of chancelloriids Chancelloria sp. are also reported from that level (Gonam; Khomentovsky & Karlova, 1993; projected herein onto the Siberian δ 13 C reference scale in accordance with Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
Sclerites of the protoconodont Protohertzina anabarica first appear in the Nemakit-Daldynian Stage in Siberia (Nemnekey).
“S1 . Sclerites of protoconodonts Protohertzina anabarica and P . unguliformis (Nemnekey; Khomentovsky & Karlova, 1991, 1993; projected onto the Siberian δ 13 C reference scale by Brasier, Khomentovsky & Corfield, 1993).”
From Chronology of early Cambrian biomineralization (2012) · cites this paper as Brasier, Khomentovsky & Corfield, 1993
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KAUFMAN, A., & KNOLL, A. (1995) · Precambrian Research · doi:10.1016/0301-9268(94)00070-8 · Cited by 1,167 · see citing works
The earliest Cambrian record of animals and ocean geochemical change
Maloof, A. C., Porter, S. M., Moore, J. L., Dudas, F. O., Bowring, S. A., Higgins, J. A., Fike, D. A., & Eddy, M. P. (2010) · Geological Society of America Bulletin · doi:10.1130/b30346.1 · Cited by 419 · see citing works
Brasier, M. D., Shields, G., Kuleshov, V. N., & Zhegallo, E. A. (1996) · Geological Magazine · doi:10.1017/s0016756800007603 · Cited by 331 · see citing works
Self-citationChronology of early Cambrian biomineralization
KOUCHINSKY, A., BENGTSON, S., RUNNEGAR, B., SKOVSTED, C., STEINER, M., & VENDRASCO, M. (2012) · Geological Magazine · doi:10.1017/s0016756811000720 · Cited by 224 · see citing works
Smith, E. F., Macdonald, F. A., Petach, T. A., Bold, U., & Schrag, D. P. (2016) · Geological Society of America Bulletin · doi:10.1130/b31248.1 · Cited by 121 · see citing works
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Topper, T., Betts, M. J., Dorjnamjaa, D., Li, G., Li, L., Altanshagai, G., Enkhbaatar, B., & Skovsted, C. B. (2022) · Earth-Science Reviews · doi:10.1016/j.earscirev.2022.104017 · Cited by 64 · see citing works
“Dvortsy/Mt Konus section compiled with data obtained from Khomentovsky and Karlova, 1993; Braiser et al., 1993; Kouchinsky et al., 2007, 2012.”
BackgroundMethodResultInfluentialZhuravlev, A. Y., Mitchell, E. G., Bowyer, F., Wood, R., & Penny, A. (2022) · Nature Communications · doi:10.1038/s41467-022-35283-5 · Cited by 24 · see citing works
- Authors
- Brasier, M. D., Khomentovsky, V. V., & Corfield, R. M.
- Affiliations
- University of Oxford (GB)
- Siberian Branch of the Russian Academy of Sciences (RU)
- Venue
- Terra Nova
- Publisher
- Wiley
- Published
- 1993-05
- Volume
- 5
- Issue
- 3
- Pages
- 225-232
- ISSN
- 0954-4879 (ISSN-L)
- 1365-3121
- OpenAlex
- W2103544931
- Cited by
- 60
- References
- 1
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 3 · 2023: 4 · 2022: 5 · 2020: 3 · 2019: 2 · 2018: 2 · 2017: 2 · 2016: 1 · 2015: 1 · 2014: 1
- FWCI
- 5.54
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Terra Nova (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Keywords
- Precambrian-Cambrian boundary, stable isotopes, carbon isotopes, oxygen isotopes, δ18O, Tommotian, Siberian Platform, Eastern Siberia, biostratigraphic correlation
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