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Now showing items 21-40 of 62
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(1985)Episodic volcanism favors, as shown by examples from Europe, the USA, and Brazil, the formation of organic-rich sediments (hydrocarbon source rocks). The examples examined from Europe comprise the Lower Carboniferous ...
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(2003)Four new taxa of the subfamily Brachyericinae, Exallerix manahan sp. nov. (Lower Oligocene of Mongolia), Synexallerix otus gen. et sp. nov. (Lower Miocene of eastern Kazakhstan), Postexallerix securis gen. et sp. nov. ...
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(1998)Assemblages of spores, pollen, and organic-walled phytoplankton were studied in the Middle Eocene-Oligocene sequence of Severnye Ergeni. The dinocyst zonal assemblages were described, and anomalies in their composition ...
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(1989)Our work gave new paleontologic and radiometric data on the age of the sedimentary, volcanogenic-sedimentary and igneous rocks in the structurally most complex northern part of Bering Island, which supplement existing ...
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(1990)The shelf deposits off South Vietnam are dominated by Oligocene-to-Miocene clayey carbonate sandstones and argillites, generally resting on a silicic crystalline basement. Penetration of the basement yielded oil flows from ...
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(1998)This article presents the Oligocene and lower Miocene diatom zonation for the North Pacific. The data obtained in Leg 145 of the Oceanic Drilling Program (ODP) allowed a subdivision of Oligocene and lower Miocene deposits ...
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(1998)Planktonic foraminifers and calcareous nannoplankton were first recorded along with benthic foraminifers in the Upper Paleogene section of the Kronotskii Peninsula, eastern Kamchatka. The fauna permits the assignment of ...
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(1991)A stable and well defined magnetization with D = 350°, I = 55.5° and alpha95 = 4°, carried by hematite, is isolated in the red beds of the Tajik basin. The fold test is positive (99% probability) and this magnetization ...
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(1996)This paper considers the litho-facial environments that existed in the Caucasus region during the Oligocene and Miocene. The analyzed distribution patterns of reef deposits, evaporites, rock slide and avalanche facies, ...
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(1995)A numerical model which describes oxygen isotope exchange during burial and recrystallization of deep-sea carbonate is used to obtain information on how sea surface temperatures have varied in the past by correcting measured ...
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(2001)Tertiary vertebrates collected in 1995 in the Askazansor Fm. (Southwestern Betpakdala, South Kazakhstan) provide new data for systematics and the age of the fossiliferous deposits. The lower part of the Askazansor Fm. ...
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(2003)The silicon isotope composition (30Si) of biogenic opal provides a view of the silica cycle at times in the past. Reconstructions require the knowledge of silicon isotope fractionation during opal biomineralization. The ...
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(1998)Upper Eocene, Oligocene, and lower Miocene units were distinguished in the Lower Cenozoic Machigar and Tumi formations of the Schmidt Peninsula, northern Sakhalin, using distribution patterns of 77 mollusk species. A ...
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(2003)The increasing effects of African–Eurasian convergence during the Tertiary resulted in the uplift and emergence of the Northern and Southern Peri-Tethys platforms. Palaeogeographic maps covering six selected time slices, ...
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THE LARGEST ASIATIC AMPHECHINUS (ERINACEIDAE, INSECTIVORA, MAMMALIA) FROM THE OLIGOCENE OF MONGOLIA (2002)A lower jaw fragment of a new hedgehog species, Amphechinus gigas sp. nov., from the Oligocene Shand-Gol Formation of Mongolia is described. This species is substantially larger than A. rectus, A. akespensis and other known ...
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(1998)The upper Oligocene continental deposits are widespread in the southern Belarus. They are represented by the liman-deltaic sand and clay beds of the Starodubka Formation associated with monomineral lacustrine quartz sands, ...
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(2001)Stratigraphic position and distribution of the lower Oligocene Kurgan Beds in southern West Siberia are considered. Their age is substantiated by the data on malacofauna, ichthyofauna, dinocysts, spores, and pollen. Two ...
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(2003)Osmium (Os) isotope analyses of bulk sediments from the South Atlantic, Equatorial Pacific, and the Italian Apennines yield a well-dated and coherent pattern of 187Os/188Os variation from the late Eocene to the early ...
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(1996)The results of research show that the main geologic events Western Siberia at the end of the Eocene occurred in a succession of negative and positive tectonic movements that brought about regression of the basin. The climate ...
Now showing items 21-40 of 62