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Now showing items 21-40 of 89
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(2003)Fossil bivalves bearing oblique ribs first appeared in the Mid Ordovician but their diversity remained low during the Palaeozoic. The diversity soon increased after the Early Triassic, peaking in the Early Cretaceous. The ...
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(2003)The Volkhov Regional Stage (Middle Ordovician) in the East Baltic preserves diverse fossil assemblages dominated by epibenthic suspension feeders. Brachiopods, ostracodes, conodonts, echinoderms and bryozoans are the main ...
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FIRST SM-ND DATA ON LATE ORDOVICIAN AGE OF GRANITOIDS OF THE VERKHNYAYA MAYA UPLIFT, OKHOTSK MASSIF (2003)The Verkhnyaya Maya Uplift (VMU), which extends from upper reaches of the Maya River along its left bank to the Inikan River in the eastern part of the Yudoma-Maya Highland, is restricted to the complex junction of ...
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(2003)A huge fluorite deposit at Voznesenka in the Khanka massif, Far East Russia is concluded to have formed at ca. 450 Ma in Late Ordovician time based on the K-Ar ages for Li-micas in the fluorite ore and greisenized leucogranite ...
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GEODYNAMIC EVOLUTION OF THE EUROPEAN VARISCAN FOLD BELT: PALAEOMAGNETIC AND GEOLOGICAL CONSTRAINTS (1997)The Variscan fold belt of Europe resulted from the collision of Africa, Baltica, Laurentia and the intervening microplates in early Paleozoic times. Over the past few years, many geological, palaeobiogeographic and ...
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(1989)Analysis of the evolution of Phanerozoic stratigraphic complexes of the western margin of the East European craton (EEC) and the Central European Platform (CEP) shows that their formation depended on the corresponding ...
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(2001)The Zhelannoe vein quartz and rock crystal deposit are unique in their geological structure, scale and high quality of ore mineralization and mineral product. The economic ores of the deposit are enclosed in monomineralic ...
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(1996)The Muruntau gold deposit in the Kyzylkum desert of Uzbekistan is the largest single deposit (> 1100 tonnes of gold) of the class of low-sulfide syndeformation/synigenous gold deposits formed in the brittle/ductile transition ...
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(2001)We have analyzed 214 fossil apatite samples from nine stratigraphic sections worldwide that cover the lower Cambrian to lower Ordovician for their strontium isotope ratios. Of these samples, 180 from six sections that cover ...
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(1996)Pristine conodonts (CAI =< 1.5), inarticulate brachiopods, and conulariids, all from a single hand sample of Ordovician limestone, define a co-varying trend of 87Sr/86Sr and Sr concentration. Most of the apatitic fossils ...
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(2003)The Vendian-Early Cambrian, Middle Cambrian, and Early Ordovician volcanosedimentary deposits of the Martaiga Block of the Kuznetsk Alatau paleoisland arc (55.5° N, 88° E) have been investigated paleomagnetically. Their ...
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(2001)The helcionelloid mollusc Chuiliella elenae gen. et sp. nov. is described from the Lower Ordovician of Kazakhstan. It represents the geologically youngest record of a group of mainly bilaterally symmetrical ancient molluscs ...
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(2004)Upper Cambrian-Lower Ordovician volcanic-siliceous-terrigenous strata of the Zasur'ya Group belonging to the Gorny Altai segment of the Paleo-Asian Ocean are considered in this paper. The Gorny Altai segment developed over ...
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(1995)The chemical and mineralogical compositions of Llanvirnian (Ordovician) iron and associated phosphate ooids from Sweden, Estonia and Russia have been examined. The oolites are generally thin and lean (mud supported), and ...
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(2003)The Ordovician iron oolites in Baltoscandia are generally geographically extensive but lean, [The oolites were formed during the period of the highest global iron oolite production ever. Most of the major oolites from this ...
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(2004)U-Pb- and Ar-Ar-geochronologic data are presented, obtained for Posolnenskii and Nizhnekanskii massifs located in the central and south-western parts of Angaro-Kanskii block and breaking through the metamorphic rocks of ...
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(1999)Review of sea-level changes during the big five mass extinctions and several lesser extinction events reveals that the majority coincide with large eustatic inflexions. The degree of certainty with which these eustatic ...
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(2002)Bryozoa (23 species) from many boreholes in the Belarussian part of the Podlasic-Brest Depression and some adjacent areas of the East European Platform arc described. Only bryozoa from the orders Cystoporida (suborder ...
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(2003)The paper reviews and integrates the recent geological and geochronological data, which allow us to recognize three stages of the evolution of the Paleo-Asian Ocean.The opening of the Paleo-Asian Ocean at 970-850 Ma is ...
Now showing items 21-40 of 89