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Now showing items 41-60 of 89
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(2001)For the first time, a large variety of Stromatoporoidea is recorded from the Ordovician of the southern facies zone of the Taimyr Peninsula. Seven new species and two new genera are described. The majority of Ordovician ...
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(2003)Results from coupled ice-sheet and atmospheric general circulation models show that the waxing and waning of ice sheets during the Late Ordovician were very sensitive to changes in atmospheric pCO2 and orbital forcing at ...
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(2003)The geologic structure, geochemistry, lithology, and paleontology of the Late Cambrian-Early Ordovician volcanosedimentary Zasur'ya Group in Gorny Altai are considered. Its geochemical parameters, lithologic features, and ...
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(1997)The volume of both original and published material on the fauna, composition, and facies types of the Ordovician deposits of Penzhinskii Range is summarized in this work. The deposits (the Elgeminai Group) represent a ...
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(2003)A number of palaeobiogeographical models for Ordovician organic-walled microphytoplankton (acritarchs, prasinophytes, and related groups) have been published during the past 30 years. A modern synthesis of Ordovician ...
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(2003)Trilobites of the subfamily Asaphinae Burmeister (genus Asaphus s.l.) coming from natural out-crops of the Ordovician beds on the southern shore of Lake Ladoga are monographically studied and revised. Forty-one taxa of the ...
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(1998)Detailed description of the two newly discovered Hecker-type mud mounds from the Babino quarry is given. A complex multistory internal structure of one of the buildups is well established. The main stages of development ...
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(2003)The discreteness or otherwise of major Ordovician and Silurian terranes can be recognised by the shallow-water benthic faunas which lived upon them. Their borders are often indicated by the disposition of progressively ...
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(2002)During the Middle-Late Ordovician, Mongolian heliolitoids increased their sizes, diversity of colony shapes, and longevity. Their biotopes, restricted to the sublittoral zone, were more uniform than those of the Tabulata ...
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(2003)Three new Middle–Late Ordovician and two new Early Carboniferous paleomagnetic poles have been obtained from the North Tien Shan Zone (NTZ) of the Ural–Mongol belt in Kyrgyzstan and Kazakhstan. Paleolatitudes for the ...
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(2003)A major macroevolutionary trend in gastropod larval shell morphology occurred throughout the middle and late Paleozoic. The majority of Ordovician and Silurian gastropods have openly coiled initial whorls; this morphology ...
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(2004)Phylogenetic analysis of the Early and early Middle Ordovician (Tremadoc and Arenig) ostracod species of Baltoscandia suggests a polyphyletic origin for the suborder Beyrichiocopa. Binodicopes, leiocopes and eridostracans ...
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(2002)The Laurentian, Baltic, and Siberian blocks of the modern circum-Arctic were scattered across a broad area between 10°S and 30°N during the Late Ordovician. Closure of the Iapetus Ocean during the Ordovician and Early ...
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(1989)The Paleozoic fold belt of southern Mongolia includes two systems, the Variscan (South Mongolian) and the Indosinian (Inner Mongolian or East Gobi). The first arose in the Early Carboniferous in the area of an old ocean ...
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PROXIMAL STRUCTURE AND DEVELOPMENT IN THE ORDOVICIAN GRAPTOLITE PARISOGRAPTUS CHEN AND ZHANG, 1996 (2003)The proximal development of Parisograptus Chen and Zhang is described from three-dimensionally preserved specimens. The unique development features an origin of proximal thecae like a string of pearls vertically upon each ...
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(2003)Radiaxial fibrous calcite (RFC) has previously been interpreted as a marine or replacive cement. Study of the Dongjeom Formation (Early Ordovician), Korea, shows that RFC can form in marine-meteoric mixing zones as a ...
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(2004)For over one hundred years the Ordovician fossil Solenopora Dybowski has been widely considered to be a calcified red alga. The type species, Solenopora spongioides, consists of tubes with longitudinally flexuous walls, ...
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(2003)Here we present Sr, C, and O isotope curves for Ordovician marine calcite based on analyses of 206 calcitic brachiopods from 10 localities worldwide. These are the first Ordovician-wide isotope curves that can be placed ...
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(1996)The modern substantiation of the boundaries in the Phanerozoic scale of geologic time is discussed with reference to absolute geochronology. The critical analysis of the isotopic-geochronologic data that form the basis of ...
Now showing items 41-60 of 89