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Botomian

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Journal Article
Journal: Geology
Published: 01 April 1996
Geology (1996) 24 (4): 311–314.
... 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...
Journal Article
Journal: Geology
Published: 01 May 1994
Geology (1994) 22 (5): 455–458.
...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...
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Scheme of facies zonation of Cambrian deposits (<span class="search-highlight">Botomian</span> Stage) based on th...
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
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Stratigraphic range of trilobites in the <span class="search-highlight">Botomian</span>–Toyonian (Lower Cambrian)...
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.
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Stratigraphic subdivision of the <span class="search-highlight">Botomian</span> and Toyonian stages (Lower Cambri...
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.
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Proposed correlation of Tommotian–<span class="search-highlight">Botomian</span> δ 13 C curves from the Bol’shaya...
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
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Figure  5. Histograms of extinction intensity metrics, with kernel density ...
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
Journal: PALAIOS
Published: 01 April 2004
PALAIOS (2004) 19 (2): 178–183.
...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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Journal Article
Published: 01 August 2021
Russ. Geol. Geophys. (2021) 62 (08): 914–928.
...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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Figure  6. Histograms of time-adjusted extinction intensity metrics, with k...
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
Published: 01 July 2011
Russ. Geol. Geophys. (2011) 52 (7): 717–724.
...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
Published: 01 November 2005
Geological Magazine (2005) 142 (6): 751–763.
... 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...
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Journal Article
Published: 01 December 2002
Journal of the Geological Society (2002) 159 (6): 645–658.
...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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Journal Article
Journal: GSA Bulletin
Published: 01 September 2002
GSA Bulletin (2002) 114 (9): 1070–1088.
... 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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Journal Article
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...
FIGURES
Journal Article
Journal: Geology
Published: 01 October 1993
Geology (1993) 21 (10): 917–920.
... 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...
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Fauna distribution in Section 3. Stages:  A  — Nemakit-Daldyn,  B  — Tommot...
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 .
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Time scale showing several well-known Cambrian fossil Lagerstätten. Region...
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.
Journal Article
Published: 01 July 2023
Russ. Geol. Geophys. (2023) 64 (7): 839–846.
..., which accumulated sediments with elevated and sometimes anomalously high concentrations of planktonic and benthic organic matter. These are 1) local centers in the Tommotian (Oksym Formation) and Botomian stages of the lower Cambrian, Mayan (Elogui and Pudzhelga formations) and Ayusokkanian (Kondes...
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Spatial distribution of ε Nd (t) values in fossil apatite for different Nem...
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) .