Cited by 331Paleontology and Stratigraphy of FossilsGeological and Geochemical AnalysisPaleontology and Evolutionary Biology

The DOI matches its Crossref record; 60 of the 61 references it cites were found in a registry or an index.

Integrated chemo- and biostratigraphic calibration of early animal evolution: Neoproterozoic–early Cambrian of southwest Mongolia

Brasier, M. D., Shields, G., Kuleshov, V. N., Zhegallo, E. A.·1996·Geological Magazine

Abstract

Five overlapping sections from the thick Neoproterozoic to early Cambrian sediments of western Mongolia were analysed to yield a remarkable carbon-isotope, strontium-isotope and small shellyfossil (SSF) record. Chemostratigraphy suggests that barren limestones of sequences 3 and 4, which lie above the two Maikhan Uul diamictites, are post-Sturtian but pre-Varangerian in age. Limestones and dolomites of sequence 5, with Boxonia grumulosa, have geochemical signatures consistent with a post-Varangerian (Ediacarian) age. A major negative δ 13 C anomaly (feature ‘W’) in sequence 6 lies a shortdistance above an Anabarites trisulcatus Zone SSF asemblage with hexactinellid sponges, of probable late Ediacarian age. Anomaly ‘W’ provides an anchor point for cross-correlation charts of carbon isotopes and small shelly fossils. Trace fossil assemblages with a distinctly Cambrian character first appear in sequence 8(Purella Zone), at the level of carbon isotopic feature ‘B’, provisionally correlated with the upper part of cycle Z in Siberia. A paradox is found from sequence 10 to 12 in Mongolia: Tommotian-type SSFs continue to appear, accompanied by Nemakit-Daldynian/Tommotian-type 87 Sr/86 Sr ratios but by increasingly heavyδ 13 C values that cannot be matched in the Tommotian of eastern Siberia. The steady rate of generic diversification in Mongolia also contrasts markedly with the Tommotian ‘diversity explosion’ in eastern Siberia, which occurs just above a major karstic emergence surface. One explanation is that sequences 10 to 12 in Mongolia preserve a pre-Tommotian portion of the fossil record that was missing or removed in easternSiberia. The Mongolian sections certainly deserve an important place in tracing the true course and timing of the ‘Cambrian radiation’.

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Crossref · 10.1017/s0016756800007603

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  1. Voronova, 1986, Organic remains in the Lower Cambrian strata of the Zavkhan and Khungiy interfluve (Mongolia), Akademiya Nauk SSSR, Sibirskoe Otdelinie, 669, 163
  2. Ushatinskaya, 1995, The earliest Ungulates, 262, 91
  3. Ushatinskaya, 1993, New genus of paterinid (brachiopod) from the Lower Cambrian of western Mongolia, Paleontological Zhurnal, 1, 115
  4. Voronin, 1983, Precambrian—Cambrian deposits of the Zuune Arts section in Western Mongolia, Byulleten’ Moskovskogo Obschestva Ispytateley Prirody, 58, 53
  5. Raaben, 1969, Biostratigraphic characteristics of the Upper Riphean in the Arctic, Doklady Akademii Nauk, 184, 676
  6. Missarzhevsky, 1977, Palaeozoic Invertebrata of Mongolia, 5, 10
  7. Voronin, 1982, Trudy Sovmestnaya Sovetsko-Mongol’skaya Paleontologicheskaya Ekspeditsiya, 18, 180
  8. Markova, 1972, On the problem of the Vendian—Cambrian of the south-western part of Mongolia, Byulleten’ Moskovskogo Obschchestva Ispytateley Prirody, 47, 57
  9. Markova, 1975, Stratigraphy of the Lower and Middle Paleozoic of Western Mongolia, 120
  10. Lesnov, 1993, Fourth International Symposium on Geodynamic evolution of Palaeo-Asian ocean, 97
  11. Korobov, 1980, Lower Cambrian and Carboniferous biostratigraphy of Mongolia, 26, 601
  12. Ilyin, 1982, Geological development of Southern Siberia and Mongolia in the late Precambrian—Cambrian, 116
  13. Hamdi, 1989, Stratigraphy and palaeontology of the Late Precambrian to early Cambrian in the Alborz Mountains, northern Iran, Geological Survey of Iran, 59, 41
  14. Gorokhov, 1995, Sr isotopic Composition in Riphean, Vendian and Lower Cambrian carbonates from Siberia, Stratigraphy and Geological Correlation, 3, 1
  15. Gibsher, 1990, Pozdniy Dokembriy i Ranniy Paleozoy Sibiri. Voprosy Regional’noy Stratigraphii, 79
  16. Gibsher, 1991, Late Precambrian and Early Palaeozoic of Siberia Siberian Platform and its framework, 107
  17. Endonzhamts, 1988, Pozdniy Dokembriy i Ranniy Paleozoy Sibiri. Riphey i Vend, 150
  18. Dorjnamjaa, 1991, Dokembriy Mongolii
  19. Buyakayte, 1989, 718 million years: the Rb—Sr erochron of the Arkoi Series of Eastern Sayan, Doklady Akademii Nauk SSSR, 150
  20. Bezzubetsev, 1963, On the Precambrian-Cambrianstratigraphy of the Dzabkhan River Basin, Materials on the Geology of MPR, 1963, 29
  21. Astashkin, 1995, The Cambrian System of th Foldbelts of Russia and Mongolia
  22. Amantov, 1963, The principal characteristic features of stratigraphy and environmental conditions for the formation of Cambrian deposits in the north-east of Mongolia, Materials on the Geology of the MPR, 1963, 15
  23. Pelechaty, Bulletin of the Geological Society of America
  24. Korobov, 1977, Palaeozoic Invertebrata of Mongolia, 5, 7
  25. Baikova, 1994, Sm-Nd age of Gashunnursky dyke complex (Mongolia), Doklady Academii Nauk Rossii, 334, 343
  26. Missarzhevsky, 1982, Raschlenenie i korrelyatsia pogranichnykh tolshch dokembriya i kembriya ponekotorym problematichnym gruppam skeletnykh okamenelostey, Byulleten’ Moskovskogo Obschchestva Ispyateley Prirody, 57, 52
  27. Drozdova, 1980, Algae in Lower Cambrian mounds of western Mongolia, Trudy Sovmestnaya Sovetsko—Mongol’skaya Paleontologicheskaya Ekspeditsiya, 10, 1
  28. Dorjnamjaaa, 1993, Precambrian—Cambrian Geology of the Dzavkhan Zone, 36
  29. Sayutina, 1985, Problematics of the Precambrian and Palaeozoic, 632, 38
  30. Esakova, 1996, Sovmestnaya Sovetsko—Mongol’skaya Paleontologicheskaya Ekspeditsiya, 46, 208
  31. Zhegallo, 1991, Guidebook for the International excursion to the Vendian—Cambrian deposits of the Dzabkhan Zone of Mongolia, 24
  32. Pokrovsky, 1993, Isotopic correlation of Precambrian and Cambrian of the Siberian platform, Doklady Akademy Nauk, 329, 768

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Metadata

Authors
Brasier, M. D., Shields, G., Kuleshov, V. N., & Zhegallo, E. A.
Affiliations
  • University of Oxford (GB)
  • Geological Institute (CH)
  • Russian Academy of Sciences (RU)
Venue
Geological Magazine
Published
1996-07
Volume
133
Issue
4
Pages
445-485
ISSN
  • 0016-7568 (ISSN-L)
  • 1469-5081
OpenAlex
W2146761970
Cited by
331
References
61
Citations by year
2026: 12 · 2025: 13 · 2024: 9 · 2023: 11 · 2022: 16 · 2021: 13 · 2020: 17 · 2019: 14 · 2018: 11 · 2017: 10 · 2016: 10 · 2015: 8 · 2014: 5 · 2013: 16 · 2012: 8
FWCI
16.71
Type
journal article
Language
en
Open access
closed
Locations
  • Geological Magazine (publishedVersion)
  • reroDoc Digital Library (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
Keywords
early animal evolution, chemostratigraphy, biostratigraphy, carbon isotopes, strontium isotopes, small shelly fossils, Ediacaran, Cambrian explosion, Tommotian, trace fossils, Siberia

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