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Journal Article

Anoxia as the cause of the mid-Early Cambrian (Botomian) extinction event Available to Purchase

Andrey Yu. Zhuravlev, Rachel A. Wood
Journal: Geology
Published: 01 April 1996
Geology (1996) 24 (4): 311–314.
DOI: https://doi.org/10.1130/0091-7613(1996)024<0311:AATCOT>2.3.CO;2
... Bay regression event, and a newly observed but more severe disruption during the early Botomian, here named the Sinsk event. During the Sinsk event, the shallow-water benthos of the so-called Tommotian fauna, together with archaeocyaths and some trilobites, underwent a rapid decline. The Sinsk event...
View PDF for article title, Anoxia as the cause of the mid-Early Cambrian (<span class="search-highlight">Botomian</span>) extinction event
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Journal Article

Multiple δ 13 C excursions spanning the Cambrian explosion to the Botomian crisis in Siberia Available to Purchase

M. D. Brasier, R. M. Corfield, L. A. Derry, A. Yu. Rozanov, A. Yu. Zhuravlev
Journal: Geology
Published: 01 May 1994
Geology (1994) 22 (5): 455–458.
DOI: https://doi.org/10.1130/0091-7613(1994)022<0455:MCESTC>2.3.CO;2
...M. D. Brasier; R. M. Corfield; L. A. Derry; A. Yu. Rozanov; A. Yu. Zhuravlev Abstract New high-resolution δ 13 C data through the Lower Cambrian of Siberia reveal multiple, positive excursions coincident with phases in the "explosion" of invertebrate phyla (Nemakit-Daldynian to middle Botomian...
View PDF for article title, Multiple δ 13 C excursions spanning the Cambrian explosion to the <span class="search-highlight">Botomian</span> crisis in Siberia
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Scheme of facies zonation of Cambrian deposits (Botomian Stage) based on the results of deep drilling and interpretation of seismic data. 1, major basement highs (zones where the Cambrian is absent); 2, zone of absence of the Inikan Formation, as indicated by seismic data; 3–6, salt basin facies: 3, penetrated by wells, 4, predicted from seismic data, 5, mapped based on drilling and seismic data, 6, inferred; 7–10, barrier-reef facies: 7, penetrated by wells, 8, mapped from seismic data, 9, mapped from drilling and seismic data, 10, inferred; 11–15, open basin facies: 11, penetrated by wells, 12, mapped from seismic data, 13, predicted from seismic data, 14, mapped from drilling and seismic data, 15, inferred; 16, massive body-type anomalies of the wave field. Abbreviated names of formations and strata: SK, Sinyaya-Kutorgina, Ud, Udachnaya, Ol, Olekma, Km, Kumakh. For wells abbreviations see Fig. 1.

Scheme of facies zonation of Cambrian deposits (Botomian Stage) based on th... Available to Purchase

Published: 01 August 2021
Fig. 9. Scheme of facies zonation of Cambrian deposits (Botomian Stage) based on the results of deep drilling and interpretation of seismic data. 1 , major basement highs (zones where the Cambrian is absent); 2 , zone of absence of the Inikan Formation, as indicated by seismic data; 3–6 , salt
Image
Stratigraphic range of trilobites in the Botomian–Toyonian (Lower Cambrian) boundary stratotype sections in the middle reaches of the Lena River.

Stratigraphic range of trilobites in the Botomian–Toyonian (Lower Cambrian)... Available to Purchase

Published: 01 July 2011
Fig. 2. Stratigraphic range of trilobites in the Botomian–Toyonian (Lower Cambrian) boundary stratotype sections in the middle reaches of the Lena River.
Image
Stratigraphic subdivision of the Botomian and Toyonian stages (Lower Cambrian) of the Siberian Platform and the position of the lower boundary of the Toyonian.

Stratigraphic subdivision of the Botomian and Toyonian stages (Lower Cambri... Available to Purchase

Published: 01 July 2011
Fig. 5. Stratigraphic subdivision of the Botomian and Toyonian stages (Lower Cambrian) of the Siberian Platform and the position of the lower boundary of the Toyonian.
Image
Proposed correlation of Tommotian–Botomian δ13C curves from the Bol’shaya and Malaya Kuonamka sections (this paper) with the reference curve from the southern part of the Siberian Platform (adapted from Brasier et al. 1994b). Biozones of the Yudoma–Olenyok facies zone adapted from Pel’man et al.(1990) and Val’kov (1975; 1987; 1993); those of the transitional facies zone from Brasier et al. (1994b).

Proposed correlation of Tommotian–Botomian δ 13 C curves from the Bol’shaya... Available to Purchase

Published: 01 July 2001
Figure 4. Proposed correlation of Tommotian–Botomian δ 13 C curves from the Bol’shaya and Malaya Kuonamka sections (this paper) with the reference curve from the southern part of the Siberian Platform (adapted from Brasier et al. 1994 b ). Biozones of the Yudoma–Olenyok facies zone adapted
Image
Figure 5. Histograms of extinction intensity metrics, with kernel density estimates of the underlying extinction intensity curve. Kernel density estimates are constructed with bandwidth equal to hcrit. A, Number of extinctions per interval. The p-value for testing the null hypothesis that the underlying extinction intensity curve is unimodal, indicating continuity of magnitude, was p = 0.01. B, Number of extinctions per million years (p = 0.17). C, Per-genus proportional extinctions per interval (p = 0.54). D, Per-genus proportional extinctions per million years (p = 0.48). E, Van Valen metric per interval (p = 0.99). F, Van Valen metric per million years (p = 0.48). The three highest intervals for each metric are as follows: A, Maastrichtian, upper Ashgillian, Guadalupian. B, Upper Ashgillian, Maastrichtian, lower Botomian. C, Djulfian, Dresbachian, upper Tommotian. D, Upper Tommotian, lower Botomian, upper Botomian. E, Dresbachian, upper Tommotian, Franconian. F, Upper Tommotian, lower Botomian, upper Atdabanian

Figure 5. Histograms of extinction intensity metrics, with kernel density ... Available to Purchase

Published: 01 January 2003
metric per interval ( p = 0.99). F, Van Valen metric per million years ( p = 0.48). The three highest intervals for each metric are as follows: A, Maastrichtian, upper Ashgillian, Guadalupian. B, Upper Ashgillian, Maastrichtian, lower Botomian. C, Djulfian, Dresbachian, upper Tommotian. D, Upper
Journal Article

Closing the Phosphatization Window: Testing for the Influence of Taphonomic Megabias on the Pattern of Small Shelly Fossil Decline Available to Purchase

SUSANNAH M. PORTER
Journal: PALAIOS
Published: 01 April 2004
PALAIOS (2004) 19 (2): 178–183.
DOI: https://doi.org/10.1669/0883-1351(2004)019<0178:CTPWTF>2.0.CO;2
...SUSANNAH M. PORTER Abstract Small shelly fossils (SSFs) are a group of mostly problematic, small skeletal elements preserved primarily through secondary phosphatization. They dominate lower Cambrian diversity, but appear to suffer a sharp decline in the Botomian Stage or equivalent levels outside...
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View PDF for article title, Closing the Phosphatization Window: Testing for the Influence of Taphonomic Megabias on the Pattern of Small Shelly Fossil Decline
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Journal Article

The Structure of Cambrian Deposits of the Vilyui Hemisyneclise, Based on an Integrated Analysis of Drilling and Seismic Data Available to Purchase

I.A. Gubin, A.E. Kontorovich, I.V. Korovnikov, T.M. Parfenova
Published: 01 August 2021
Russ. Geol. Geophys. (2021) 62 (08): 914–928.
DOI: https://doi.org/10.2113/RGG20214353
...Fig. 9. Scheme of facies zonation of Cambrian deposits (Botomian Stage) based on the results of deep drilling and interpretation of seismic data. 1 , major basement highs (zones where the Cambrian is absent); 2 , zone of absence of the Inikan Formation, as indicated by seismic data; 3–6 , salt...
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View PDF for article title, The Structure of Cambrian Deposits of the Vilyui Hemisyneclise, Based on an Integrated Analysis of Drilling and Seismic Data
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Figure 6. Histograms of time-adjusted extinction intensity metrics, with kernel density estimates of the underlying extinction intensity curve. Kernel density estimates are constructed with bandwidth equal to hcrit. To account for the Phanerozoic decline in extinction intensities, the data used here are residuals from a linear regression of intensity on time. Vertical axis indicates probability density; label has been omitted to save space. A, Number of extinctions per interval. The p-value for testing the null hypothesis that the underlying extinction intensity curve is unimodal, indicating continuity of magnitude, was p = 0.04. B, Number of extinctions per million years (p = 0.31). C, Per-genus proportional extinctions per interval (p = 0.48). D, Per-genus proportional extinctions per million years (p = 0.70). E, Van Valen metric per interval (p = 0.81). F, Van Valen metric per million years (p = 0.24). The three highest intervals for each metric are as follows: A, Maastrichtian, upper Ashgillian, Guadalupian. B, Upper Ashgillian, Maastrichtian, upper Eocene. C, Djulfian, Maastrichtian, Guadalupian. D, Upper Tommotian, lower Botomian, upper Botomian. E, Dresbachian, Djulfian, upper Tommotian. F, Upper Tommotian, lower Botomian, upper Atdabanian

Figure 6. Histograms of time-adjusted extinction intensity metrics, with k... Available to Purchase

Published: 01 January 2003
metric per million years ( p = 0.24). The three highest intervals for each metric are as follows: A, Maastrichtian, upper Ashgillian, Guadalupian. B, Upper Ashgillian, Maastrichtian, upper Eocene. C, Djulfian, Maastrichtian, Guadalupian. D, Upper Tommotian, lower Botomian, upper Botomian. E, Dresbachian
Journal Article

The lower boundary of the Toyonian stage (Cambrian) of the Siberian Platform Available to Purchase

I.V. Korovnikov
Published: 01 July 2011
Russ. Geol. Geophys. (2011) 52 (7): 717–724.
DOI: https://doi.org/10.1016/j.rgg.2011.06.004
...Fig. 2. Stratigraphic range of trilobites in the Botomian–Toyonian (Lower Cambrian) boundary stratotype sections in the middle reaches of the Lena River. ...
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Journal Article

New Early Cambrian bivalved arthropods from southern France Available to Purchase

JEAN VANNIER, MARK WILLIAMS, J. JAVIER ALVARO, DANIEL VIZCAÏNO, SYLVIE MONCERET, ERIC MONCERET
Published: 01 November 2005
Geological Magazine (2005) 142 (6): 751–763.
DOI: https://doi.org/10.1017/S0016756805001093
... and Botomian stages of Russian terminology. Their presence in the Pardailhan Formation supports the notion of a Botomian age, determined from archaeocyathan evidence. The North American bradoriid genus Matthoria , also possibly present in the Pardailhan Formation, is reassigned to the Cambriidae. † Author...
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View PDF for article title, New Early Cambrian bivalved arthropods from southern France
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Journal Article

Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China Available to Purchase

R.J.F. Jenkins, J.A. Cooper, W. Compston
Published: 01 December 2002
Journal of the Geological Society (2002) 159 (6): 645–658.
DOI: https://doi.org/10.1144/0016-764901-127
...R.J.F. Jenkins; J.A. Cooper; W. Compston Abstract Reassessment of faunal discoveries in the Fleurieu Peninsula, South Australia, shows that the Sellick Hill tuff is late Atdabanian or early Botomian in age and is preceded by Tommotian to Atdabanian equivalents. Previous and new sensitive high...
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View PDF for article title, Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China
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Journal Article

Depositional history of pre-Devonian strata and timing of Ross orogenic tectonism in the central Transantarctic Mountains, Antarctica Available to Purchase

Paul M. Myrow, Michael C. Pope, John W. Goodge, Woodward Fischer, Alison R. Palmer
Journal: GSA Bulletin
Published: 01 September 2002
GSA Bulletin (2002) 114 (9): 1070–1088.
DOI: https://doi.org/10.1130/0016-7606(2002)114<1070:DHOPDS>2.0.CO;2
... indicate that the Lower Cambrian Shackleton Limestone ranges from lower Atdabanian through upper Botomian. This study presents the first description of a depositional contact between the Shackleton Limestone and overlying clastic units of the upper Byrd Group. This carbonate-to-clastic transition...
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View PDF for article title, Depositional history of pre-Devonian strata and timing of Ross orogenic tectonism in the central Transantarctic Mountains, Antarctica
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Journal Article

STRATIGRAPHIC SCHEME OF THE CAMBRIAN DEPOSITS IN THE YENISEI REGION ( West Siberia ) Available to Purchase

E. A. Yolkin, V. A. Kashtanov, A. E. Kontorovich, I. V. Korovnikov, V. A. Krinin, V. A. Luchinina, S. V. Saraev, V. M. Tishchenko, Yu. F. Filippov, A. V. Khomenko
Published: 01 July 2001
Russ. Geol. Geophys. (2001) 42 (7): 959–971.
..., containing shell debris and fragments of algal colonies. Trilobites Binodaspis cf. paula Suvorova and Bonnaria sp. as well as olenellids have been found in a depth range of 2804.4–2805.9 m. They indicate the Botomian age of the host rock. We performed correlation of the sections of deep boreholes drilled...
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View PDF for article title, STRATIGRAPHIC SCHEME OF THE CAMBRIAN DEPOSITS IN THE YENISEI REGION ( West Siberia )
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Journal Article

Paleobiologic and paleoenvironmental context of coral-bearing Early Cambrian reefs: Implications for Phanerozoic reef development Available to Purchase

Michael Savarese, Jeffrey F. Mount, James E. Sorauf, Louis Bucklin
Journal: Geology
Published: 01 October 1993
Geology (1993) 21 (10): 917–920.
DOI: https://doi.org/10.1130/0091-7613(1993)021<0917:PAPCOC>2.3.CO;2
... of arid, coarse-grained, sea-marginal alluvial fans. The implications of these coral-bearing reefs are multifold. First, their existence not only extends the range of tabulatelike corals to the Botomian (middle Early Cambrian), but it adds an additional clade of participants to the Early Cambrian metazoan...
View PDF for article title, Paleobiologic and paleoenvironmental context of coral-bearing Early Cambrian reefs: Implications for Phanerozoic reef development
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Figs. 1, 2. Thalamocyathus solidus (Jazmir), × 4; l—oblique cross section of the cup, Central Siberian Geological Museum (CSGM), accession no. 991/3, sample P 60/3, thin section 1, specimen 1. South of the Vitim Upland; Ozerny ore cluster, Ulzutui Brook, Sukhaya Rechka valley, exp. P60. Oldynda Formation, Nazarovka Member, Sukhaya Rechka bed. Early Cambrian, Botomian Stage. Figs. 3-5. Tumulocyathus postnikovi Zhuravleva, sp. nov., CSGM 991/1 (holotype), sample P 60/4, thin section 1, specimen. 1. 3. part of the oblique cross section of the cup, × 5; 4. part of the structure of the outer wall, × 20; 5. part of the structure of the inner wall, × 20; For location and age see figs. 1, 2. Fig. 6. Tumulocyathus neocopinatus (Jazmir), × 10. Oblique meridional section of the cup, CSGM 991/5, sample. S 255-148, thin section 3, specimen. 1. South of the Vitim Upland; Ozernyi ore cluster, profile 10.8; borehole 255, depth 148 m. Oldynda Formation, Nazarovka Member. Early Cambrian, Botomian Stage. Fig. 7. Problematicum Rachkovskia sp., × 10. CSGM 991/2, sample. P59, thin section 1, specimen. 3. Occurrence and age as in Figs 1, 2; exposure P59. Fig. 8. Bija sibirica Vologdin, CSGM 991/7, sample. P65. South of the Vitim Upland, Ozernyi ore cluster; profile 12.6; mark 6.125. Oldynda Formation, Nazarovka Member. Early Cambrian, Botomian Stage.

Figs. 1 , 2 . Thalamocyathus solidus (Jazmir), × 4; l—oblique cross sect... Available to Purchase

Published: 01 March 1997
. P60. Oldynda Formation, Nazarovka Member, Sukhaya Rechka bed. Early Cambrian, Botomian Stage. Figs. 3 - 5 . Tumulocyathus postnikovi Zhuravleva, sp. nov., CSGM 991/1 (holotype), sample P 60/4, thin section 1, specimen. 1. 3. part of the oblique cross section of the cup, × 5; 4. part
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Fauna distribution in Section 3. Stages: A — Nemakit-Daldyn, B — Tommotian, C — Atdabanian, D — Botomian. Zones: 1 — beds with Lapworthella; 2 — beds withConotheca; 3 —Erbiella; 4 —Anopolenus henrici.

Fauna distribution in Section 3. Stages: A — Nemakit-Daldyn, B — Tommot... Available to Purchase

Published: 01 April 2002
Fig. 4. Fauna distribution in Section 3. Stages: A — Nemakit-Daldyn, B — Tommotian, C — Atdabanian, D — Botomian. Zones: 1 — beds with Lapworthella ; 2 — beds with Conotheca ; 3 — Erbiella ; 4 — Anopolenus henrici .
Image
Time scale showing several well-known Cambrian fossil Lagerstätten. Regional Siberian Stage names are as follows: N-D, Nemakit-Daldynian; T, Tommotian; A, Atdabanian; B &amp; T, Botomian and Toyonian.

Time scale showing several well-known Cambrian fossil Lagerstätten. Region... Available to Purchase

Published: 01 March 2001
Fig. 2. Time scale showing several well-known Cambrian fossil Lagerstätten. Regional Siberian Stage names are as follows: N-D, Nemakit-Daldynian; T, Tommotian; A, Atdabanian; B & T, Botomian and Toyonian.
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Spatial distribution of εNd(t) values in fossil apatite for different Nemakit-Daldynian to Botomian epi-platform basins. Where the number of samples is greater than 5, an average value ± 1σ is shown. Continental reconstruction modified after Gubanov (1998).

Spatial distribution of ε Nd (t) values in fossil apatite for different Nem... Available to Purchase

Published: 01 March 2002
Figure 4. Spatial distribution of ε Nd (t) values in fossil apatite for different Nemakit-Daldynian to Botomian epi-platform basins. Where the number of samples is greater than 5, an average value ± 1σ is shown. Continental reconstruction modified after Gubanov (1998) .