Инд. авторы:	Meert J.G., Gibsher A.S, Levashova N.M., Grice W.C., Kamenov G.D., Ryabinin A.B.
Заглавие:	Glaciation and ~770Ma Ediacara (?) Fossils from the Lesser Karatau Microcontinent, Kazakhstan
Библ. ссылка:	Meert J.G., Gibsher A.S, Levashova N.M., Grice W.C., Kamenov G.D., Ryabinin A.B. Glaciation and ~770Ma Ediacara (?) Fossils from the Lesser Karatau Microcontinent, Kazakhstan // Gondwana Research. - 2011. - Vol.19. - Iss. 4. - P.867-880. - ISSN 1342-937X. - EISSN 1878-0571.
Внешние системы:	DOI: 10.1016/j.gr.2010.11.008; SCOPUS: 2-s2.0-79954629619;
Реферат:	eng: The Cambrian explosion, c. 530-515. Ma heralded the arrival of a diverse assembly of multicellular life including the first hard-shelled organisms. Fossils found in Cambrian strata represent the ancestors of most modern animal phyla. In contrast to the apparent explosiveness seen in the Cambrian fossil record, studies of molecular biology hint that the diversification observed in Cambrian strata was rooted in ancestry extending back into the Ediacaran (635-542. Ma). Fossil evidence for this mostly cryptic phase of evolution is derived from the soft-bodied fossils of the Ediacaran biota found throughout the world and bilaterian embryos found in the Doushantuo lagerstätte in South China. The first appearance of Ediacara fauna is thought to have followed the last of the ~. 750-635. Ma Neoproterozoic glacial episodes by 20-30. million years. In this paper, we present evidence for the oldest discovery of the 'Ediacara' discoidal fossils Nimbia occlusa and Aspidella terranovica (?) that predate the early Cryogenian glaciations by more than fifty million years. There is considerable disagreement over the significance of discoidal Ediacaran fossils, but our findings may support earlier suggestions that metazoan life has roots extending deeper into the Proterozoic Eon. We also confirm the presence of a Late Cryogenian (e.g. 'Marinoan') glaciation on the Lesser Karatau microcontinent including dropstones and striated clasts within the glacial strata. © 2010 International Association for Gondwana Research.
Ключевые слова:	Snowball Earth; Nimbia; Glaciations; Ediacaran; Cambrian explosion;
Издано:	2011
Физ. характеристика:	с.867-880