Results 141 to 150 of about 2,364 (193)
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On the constructive possibilities of the Riphean microfossils Eosaccharomyces
Paleontological Journal, 2013Yeast-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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On Aphebian stromatolites and Riphean stromatolite stratigraphy
Precambrian Research, 1977Abstract New occurrences of typical Riphean stromatolite and microphytolite groups are reported and illustrated from typical Aphebian sequences in Canada. These include Minjaria, Colonnella, and Kussiella from the Mistassini Group of central Quebec, Gymnosolen, Jacutophyton garganicum, Minjaria, Colleniella, Kussiella, Tungussia, Lenia, Osagia, and ...
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The Upper Riphean of the Yenisei Range
Russian Geology and Geophysics, 2007Abstract 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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Stratigraphy and Geological Correlation, 2007
Excellently preserved organic-walled and silicified microfossils are first found in the Lower Riphean Ust-Il’ya and Kotuikan formations of the Billyakh Group in the northern slope of the Anabar Uplift (the Fomich River basin). Similar assemblages were previously known only from sections located southward in the Kotuikan River basin, and taxonomic ...
V. N. Sergeev +2 more
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Excellently preserved organic-walled and silicified microfossils are first found in the Lower Riphean Ust-Il’ya and Kotuikan formations of the Billyakh Group in the northern slope of the Anabar Uplift (the Fomich River basin). Similar assemblages were previously known only from sections located southward in the Kotuikan River basin, and taxonomic ...
V. N. Sergeev +2 more
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Lower and middle Riphean lithologic complexes of the world
International Geology Review, 1982(1982). Lower and middle Riphean lithologic complexes of the world. International Geology Review: Vol. 24, No. 5, pp. 509-525.
A. B. Ronov +2 more
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POSTSEDIMENTATION ALTERATION OF GLAUCONITE IN SOUTHEAST YAKUTIA RIPHEAN BEDS
International Geology Review, 1985(1985). POSTSEDIMENTATION ALTERATION OF GLAUCONITE IN SOUTHEAST YAKUTIA RIPHEAN BEDS. International Geology Review: Vol. 27, No. 12, pp. 1451-1460.
T. A. Ivanovskaya +3 more
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Pb—Pb Age of the Bakal Ore Field Riphean Magnesite
Doklady Earth Sciences, 2018For the first time, the age of magnesite in the Lower Riphean Bakal Formation of the Southern Urals is determined by the U—Pb (Pb—Pb) method: it is equal to 1366 ± 47 Ma (MSWD = 18). The stage of magnesite formation of the Bakal ore field was associated with the Mashak rifting pulse and took place prior to the formation of industrial deposits of the ...
G. V. Ovchinnikova +4 more
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Records of a new spongelike group in the Riphean biota
Paleontological Journal, 2012New 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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, 2021
—The least altered limestones of the Ukta and Eselekh formations in the Precambrian section of the Kharaulakh uplift have a minimum 87Sr/86Sr ratio of 0.70673–0.70715.
B. Kochnev +3 more
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—The least altered limestones of the Ukta and Eselekh formations in the Precambrian section of the Kharaulakh uplift have a minimum 87Sr/86Sr ratio of 0.70673–0.70715.
B. Kochnev +3 more
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Riphean stromatolitic formations fringing the East European platform
Stratigraphy and Geological Correlation, 2007Riphean stromatolitic formations flank the East European epi-Karelian platform only in the east and northeast. They are traceable as long (over 3600 km) relatively narrow belt consisting of two rectilinear segments, one running along the Urals western flank from southern extremity of the Bashkirian meganticlinorium to the Polyudov Ridge and the other ...
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