The Ecology of the Cambrian Radiation - Andrey Zhuravlev - Chapter 5 ppt

... Voo 1994). There are signs of four Neoproterozoic -Cambrian glacial periods (figures 5. 1– 5. 2): the Lower Congo (~900 Ma), the Sturtian (~ 750 –700 Ma), the Varangerian (~ 650 –600 Ma), and the lower ... Proterozoic Sympo- sium, Geological Society of America, Memoir 161:309–3 15. Schmidt, P. W. and G. E. Williams. 19 95. The 0 5- C1099 8/10/00 2: 05 PM Page 1 05 CLIMATE C...

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... ϭ 55 5 54 5 Ma; base of Nemakit-Daldynian ϭ base of Cambrian herein ϭ 54 5 Ma; base of Tommotian ϭ 53 0 Ma; base of Atdabanian ϭ 52 8 Ma; base of Botoman ϭ 52 6 Ma; base of Toyonian ϭ 52 3 Ma; base of ... Middle Cambrian ϭ 52 0 Ma; base of Upper Cambrian ϭ 51 0 Ma; base of Ordovician ϭ 50 0 Ma. P marks the first phosphatic sedi- ments with early skeletal foss...

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... typical of deltaic areas. In the prograde delta-front sequence of the Chapel Island Formation of the Nemakit-Daldynian of Avalonia, the higher-energy environments show a preponder- ance of vertical ... the Burgess Shale of Brit- ish Columbia. Philosophical Transactions of the Royal Society ofLondon B 2 85: 227–274. Conway Morris, S. 1986. The community structure o...

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... 1927. On the feeding mecha- nism of Nebalia. Transactions of the Royal Society of Edinburgh 55 : 355 –369. Cannon, H. G. and S. M. Manton. 1927. On the feeding mechanism of a mysid crus- 18-C1099 ... hypotheses of the relationships of arthropods to Pre- cambrian and Cambrian problematic fos- sil taxa. Systematic Biology 45: 190–222. Walossek,D.1993 .The Upper Cambri...

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... for the development of infauna (Brasier and Lindsay; Droser and Li; Crimes— chapter 13); how the Early Cambrian biota changed the quality of seawater, thereby allowing the radiation of di- verse ... included, and there are data on biomarkers. COMMUNITY The theme of community considers the biotas in their ecologic context, from their di- versification to the developm...

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... closer to 54 5 Ma (Tucker and McKerrow 19 95) . The prob- lem of relating the two scales is complicated by the fact that the base of the Tom- motian was taken as the base of the Cambrian at 57 0 Ma ... APWP. The ages of the mean poles in these intervals are 50 4, 51 8, 53 3, 55 9, and 57 6 Ma, respectively. The 55 9 and 57 6 Ma mean poles are considered...

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... [Facies and stratig- raphy of the Vendian and Cambrian of the western East-European Platform], pp. 24 – 33. Tallin: Academy of Sciences of Esto- nian SSR. Brasier, M. D. 19 95. The basal Cambrian transition ... of the Innuitian Belt in the Cana- dian Arctic, which still await solution. There is no general agreement on the paleo- geographic boundaries of Siberia for...

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... 1992. Ion-probe zircon dating of a mid-Early Cambrian tuff in South Australia. Journal of the Geological Society of London 149:1 85 192. Daily, B. 1972. The base of the Cambrian and the first Cambrian ... boundary is placed at the base of the Wang- konda Formation and at the base of the trace fossil–bearing sandstones of the Winulta Formation in the Stan...

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... deposits. The Big Horse Limestone consists primarily of thin-bedded 07-C1099 8/10/00 2:08 PM Page 158 THE CAMBRIAN RADIATION AND THE DIVERSIFICATION OF SEDIMENTARY FABRICS 155 INTERNAL CLOSE-PACKING ... beds. DISCUSSION The Cambrian represents a critical point in the development of nearly all biofabrics. Near the base of the Cambrian, there was a significant shif...

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... 2132 NEM TOMMO- TIAN ATDABA- NIAN BOTO- MAN TOYO- NIAN AM- GAN MARJU- MIAN STEP- TOEAN SUN- WAP- TAN DT 0.7080 0.7090 0.7100 40 50 60 70 80 20 40 20 40 60 80 100 120 5 10 60 15 5 10 15 20 100 54 5 53 5 200 300 400 50 0 600 700 90 40 50 60 70 52 5 4 95 100 200 300 600 700 A B C D E F 08-C1099 8/10/00 2:08 PM Page 176 178 Andrey Yu. Zhuravlev the Cambrian world (Zhuravlev...

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