Results 81 to 90 of about 242 (131)

Riphean and Recent stromatolites: a comparison

American Journal of Science, 1974
Columnar Riphean forms differ from modern forms, morphological variability in Riphean forms controlled by taxonomic composition of community, stratigraphic ...
S. N. Serebryakov, M. A. Semikhatov
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Vendian and Riphean rifting in NW Scotland

Journal of the Geological Society, 1995
In the Neoproterozoic, NW Scotland was located in a tract of extending continental lithosphere that evolved into the eastern passive margin of Laurentia when Iapetus opened in the Vendian. On the NW Caledonian foreland, major rift events are inferred in the Riphean and Vendian, corresponding to the intra-Torridonian and sub-Cambrian unconformities ...
N. J. SOPER, R. W. ENGLAND
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Formation of an unusual form of Riphean Eosolenides

Paleontological Journal, 2014
A specific group of tubular microfossil Eosolenides, which display a series of biological innovations for these organic-walled microorganisms, is reported from the Meso-Neoproterozoic boundary beds (Lakhanda Microbiota, 1 Ga). This morphologically diverse group is recognized by the presence of unicellular symbionts and by an external narrowly-segmented
T. N. Hermann, V. N. Podkovyrov
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On the constructive possibilities of the Riphean microfossils Eosaccharomyces

Paleontological Journal, 2013
Yeast-like microfossils from the Meso-Neoproterozoic boundary beds of the Neruyen Formation (southeastern Siberia) are studied. The structural features of the fossil organisms the life cycle of which started with the development of single budding cells that subsequently formed complex multicellular microcolonies are described.
T. N. Hermann, V. N. Podkovyrov
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Differentiation and correlation of the Riphean rocks of Eastern Siberia

International Geology Review, 1966
The Riphean (upper) portion of the Proterozoic interval is treated as an era divided into four systems on the basis of stromatolith morphology. The evolution of the stromatoliths is traced into the Lower Cambrian in order to demonstrate that divisions of system rank can be identified by the stages of stromatolith morphogenesis, from columnar through ...
M.A. Semikhatov, V.A. Komar, S.V. Nuzhnov   +2 more
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Upper Riphean and Vendian sandstones of the Bashkirian anticlinorium

Lithology and Mineral Resources, 2010
The analysis of lithogeochemical data on the Upper Riphean and Vendian sandstones from the Bashkirian anticlinorium showed that sandstone associations formed in a passive sluggish tectonic regime in the middle Late Vendian were replaced by associations accumulated in the more active tectonic settings.
A. V. Maslov, E. Z. Gareev, V. N. Podkovyrov   +2 more
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Late Riphean Sedimentation in the Central Russian Aulacogen

Lithology and Mineral Resources, 2003
Result of the analysis of combined structural, facies, mineralogical, and micropaleontological data suggest that the formation of the Central Russian Aulacogen was related to the evolution of a major strike-slip system in the Late Riphean on the Russian Plate.
N. P. Chamov, V. V. Kostyleva, A. F. Veis, V. I. Gorbachev   +3 more
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The Upper Riphean of the Yenisei Range

Russian Geology and Geophysics, 2007
Abstract The Yenisei Range and the adjacent territories in the east are subdivided into (1) the Mid-Angara intracratonic depression; (2) the Yenisei pericratonic trough; and 3) a marginal oceanic block, the Isakovka-Predivinsk area.
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Riphean and Cambrian of central Asia

International Geology Review, 1965
Mountain structures of Central Asia are made up largely of Riphean and,Cambrian deposits that are continuous and consistent over thousands of kilometers. It is quite probable that a discrete tectonic belt existed in the Urals, Central Asia, and North China in the Riphean and Cambrian. The Riphean is late Precambrian and Early Cambrian.
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Records of a new spongelike group in the Riphean biota

Paleontological Journal, 2012
New microfossils of presumably sponge organization grade have been recorded in the Meso-Neoproterozoic boundary beds of the Riphean Lakhanda Formation (Maya River, Uchur-Maya Region, southeastern Siberia). Because of the microscopic size, they remained invisible for a long time among abundant green algae on the surface of individual acritarchs in ...
T. N. German, V. N. Podkovyrov
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