The Ecology of the Cambrian Radiation - Andrey Zhuravlev - Chapter 11 doc

... Guensburg. 1995. Ori- gin of echinoderms in the Paleozoic evolu- tionary fauna: The role of substrates. Pa- laios 10:437–453. 1 1- C1099 8/10/00 2 :11 PM Page 252 EVOLUTION OF THE HARDGROUND COMMUNITY 251 conditions, ... distributed in the Ordo- vician. The time of their occurrence and wide distribution coincided with the Ordo- vician radiation of marine biota, which...

Ngày tải lên: 06/07/2014, 21:20

... quality of seawater, thereby allowing the radiation of di- verse phototrophic communities (Zhuravlev chapter 8; Burzin et al. chapter 10); how the appearance of framework-building organisms created ... theme of community considers the biotas in their ecologic context, from their di- versification to the development of planktonic, level-bottom, reef, hardground, and deep-w...

Ngày tải lên: 06/07/2014, 21:20

... 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 Stansbury Basin. The Precambrian -Cambrian boundary ... 1992. Ion-probe zircon dating of a mid-Early Cambrian tuff in South Australia. Journal of the Geological Society of London 149:185–192. Daily, B. 1972. The bas...

Ngày tải lên: 06/07/2014, 21:20

... led to the concept of “explosive evolution.” There are a sig- nificant number of short-ranging forms in the late Precambrian, but the Cambrian is dominated by much longer-ranging forms of Phanerozoic ... web. One of the earliest records of probable metazoan life is Bergaueria-like trace fos- sils (see Crimes 1994 :114 ) from the 800 110 0 Ma Little Dal Group of the Ma...

Ngày tải lên: 06/07/2014, 21:20

... evolution of other Cambrian metazoans, the ecology of Cambrian trilobites remains poorly resolved. This chapter summarizes current knowledge of the ecology of Cambrian trilobite species and their ... the ecologic evolu- tion of these fossils. Recent interest in the Cambrian radiation has been fueled by the redescription of Cambrian soft-bodied organisms...

Ngày tải lên: 06/07/2014, 21:20

... triaromatic 2-methyl-24-ethylcholesteroid; 10, triaromatic 4-methyl-24-ethylcholesteroid; 11, gorgosterol and 4a-methylgorgosterol; 12, 27-norcholest- 5,22-en-3b-ol; 13, 24-norcholest-5,22-en-3b-ol. 21-C1099 8/10/00 2:20 PM Page 475 484 ... radiation of di- noflagellates. Paleobiology 22:329–238. Goad, L. J. and N. W. Withers. 1982. The identification of 27-nor (24R )-2 4-methyl- cho...

Ngày tải lên: 06/07/2014, 21:20

... 1995). 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 570 Ma in Harland et al. 1990. Since then, the ... interval; the substantial revision to the age of the base of the Cambrian period and other early Paleozoic stratigraphic boundaries; and, of course, the...

Ngày tải lên: 06/07/2014, 21:20

... 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 the Vendian and Cambrian. The southern ... [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....

Ngày tải lên: 06/07/2014, 21:20

... 1994. The period of evolution- ary failure and the dawn of evolutionary success: The record of biotic changes across the Precambrian -Cambrian bound- ary. In S. K. Donovan, ed., The Palaeobiol- ogy ... bulging of the crust and transgression of the platform proceeded. Com- parison of the 87 Sr/ 86 Sr record of the Ediacarian -Cambrian with that of the Cen...

Ngày tải lên: 06/07/2014, 21:20

... indicators of the climatic and environmental changes that occurred during the Neoproterozoic- Cambrian transition. They also appear to reveal the occurrence of a discrete cold period in the Cambrian: the ... Journal of the Ge- ological Society of India 43:603– 611. LeMasurier, W. E., D. M. Harwood, and D. C. Rex. 1994. Geology of Mount Murphy Vol- cano: An 8-m.y. his...

Ngày tải lên: 06/07/2014, 21:20