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Now showing items 21-40 of 150
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(2001)Carbonate platform deposits of the Shabakty Group in the Malyi Karatau Range of southern Kazakhstan contain rich brachiopod faunas of early Cambrian (Botomian)-early Ordovician (Arenig) age. Seven biostratigraphically ...
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(2003)Beyrichona taylori sp. nov., Beyrichona? angularis sp. nov., Euzepaera foveata sp. nov., Monasterium tchizhovi sp. nov., Anabarochilina karatauensis sp. nov. and the new genera Almazina with the type species A. proprius ...
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(1998)The Cambrian reef formation was limited by the Early and Middle Cambrian epochs and culminated in the Lenian-early Amgian time. Reef builders of that time were not diverse, and their agglutinative forms prevailed over ...
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(2001)Carbon isotopic oscillations are useful to elucidate the stratigraphy and biogeochemical events around the Precambrian-Cambrian transitional beds across the Siberian Platform. The similarity of trends and amplitudes of the ...
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(2004)According to the proposed hypothesis, cosmic factors were primarily responsible for the flourishing of life on Earth over the last 600 Ma. We believe that the solar orbit first reached the galactic corotation radius in the ...
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(2004)Cambrian events in the history of the different terranes comprising mosaic-block geological structures of the Altai-Sayan Folded Area is discussed. On the basis of the complex analysis of the paleontological, lithological ...
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(2001)Seawater rare-earth element (REE) distributions show heavy REE enrichment and cerium depletion but these characteristics are only rarely found in ancient, marine authigenic minerals such as carbonate fluorapatite and ...
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(1996)The Neoproterozoic–Cambrian succession in the Zavkhan Basin of western Mongolia preserves early Cambrian bioconstructions of Nemakit-Daldynian to Botomian age. As elsewhere (Siberia, Morocco), the Nemakit-Daldynian ...
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(2002)The end of the Proterozoic–beginning of the Cambrian is marked by some of the most dramatic events in the history of Earth. The fall of the Ediacaran biota, followed by the Cambrian Explosion of skeletonised bilaterians, ...
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(2003)Conflicting paleogeographic reconstructions of the Ural–Mongol fold belt have been developed over the past decade; very few of them, however, have been based on paleomagnetic data, which still remain scarce. The Chingiz ...
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EDIACARIAN SPONGE SPICULE CLUSTERS FROM SOUTHWESTERN MONGOLIA AND THE ORIGINS OF THE CAMBRIAN FAUNA (1997)Carbon and strontium isotopic data are used to show that the earliest sponge spicule clusters and associated phosphatic sediments (with Anabarites) from southwestern Mongolia are of Ediacarian age. Spicule morphologies ...
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(1996)The unstable sea-level position in the Cambrian-Ordovician boundary interval resulted in several consequent eustatic minima. Among them, the Lange Ranch (the base of the proavus Zone),Acerocare (the base of the Tremadocian, ...
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(2001)Upper Cambrian to Lower Ordovician radiolarites (alternations of ribbon-banded radiolarian cherts and siliceous shales) from Kazakhstan are dated accurately by means of conodonts. They represent the only known continuous ...
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(1986)In the Early Cambrian, there were two peaks of the increase in number of new archaeocyathan genera. These diversification bursts are, perhaps, related to significant changes in Early Cambrian palaeogeography. The first ...
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(1998)Proto-, para-, and euconodonts are characterized, and their stratigraphic significance is evaluated. General evolutionary trends and stages of development are depicted for the Proconodontus, Teridontus, and Hirsutodontus ...
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(2003)On the basis of generalizations and analysis of new materials on regional and thematic research, the main problems involved with the evolution of the Paleo-Аsian ocean and structure of the huge Ural-Mongolian Fold Belt ...
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(1996)Neoproterozoic–Cambrian rocks of the Zavkhan Basin (Govi-Altay, western Mongolia) comprise large-scale alternations of siliciclastic- and carbonate-dominated units (cf. ‘Grand Cycles’). Analysis of such depositional sequences ...
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(1989)In 1978, in Precambrian metamorphosed bauxites of the Alag Uula deposit, we found a mineral identified as gibbsite high in copper and magnesium. This deposit is in western Mongolia in the eastern part of the Yihe Daribi ...
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(1996)Seven alkylaromatic hydrocarbons with an isohexyl and a methyl substituent group on adjacent ring carbons have been identified in a suite of crude oils derived from a range of locations, source types, palaeoenvironments, ...
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(2004)The paper presents new data on the structure and composition of the Vendian-Early Cambrian oceanic crust of the Paleo-Asian ocean, which has been fragmentally preserved in Early Cambrian accretionary prisms of Gorny Altai. ...
Now showing items 21-40 of 150