Browsing ELibrary by Subject "Cambrian"
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Browsing ELibrary by Subject "Cambrian"
Now showing items 21-40 of 133
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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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(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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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 Altai-Salair area in southern Siberia is a Caledonian folded area containing fragments of Vendian–Early Cambrian island arcs. In the Vendian–Early Cambrian, an extended system of island arcs existed near the Paleo-Asian ...
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(2004)Two genetic families of "ancient" oils, the main currently prospected resources, are known on the Siberian Platform. The available information on organic geochemistry of naphthide deposits and syngenetically bituminized ...
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(1999)Isotopic and geochemical data of the Zerenda series metamorphic rocks from the Kokchetav massif are reported. Some of these rocks contain microdiamond inclusions in garnets and other indicators of ultrahigh pressure ...
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(2001)Metamorphic rocks-hydrolysates, which are strongly enriched in Al and Fe (sericite, pyrophyllite, chloritoid, diaspore, and hematite schists), are developed in the interformational contact zone between Precambrian pre-Uralide ...
Now showing items 21-40 of 133