Results 191 to 200 of about 6,764 (250)
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Palaeoworld, 2019
An integrated Early–Middle Ordovician graptolite and chitinozoan biostratigraphical study was carried out to improve the correlations between the two fossil groups in two sections in the Jiangnan Slope Region (deeper outer-shelf mud–sand–carbonate belt),
Wenhui Wang +3 more
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An integrated Early–Middle Ordovician graptolite and chitinozoan biostratigraphical study was carried out to improve the correlations between the two fossil groups in two sections in the Jiangnan Slope Region (deeper outer-shelf mud–sand–carbonate belt),
Wenhui Wang +3 more
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The chemical composition of graptolite periderm in the gas shales from the Baltic Basin of Poland
International Journal of Coal Geology, 2018Silurian graptolite shales from an exploration borehole within the Baltic Basin (N-Poland) were examined by the electron microprobe (for the first time) and micro-FTIR spectroscopy.
R. Morga, M. Kaminska
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Graptolite ontogeny and the size of the graptolite zooid
Geological Magazine, 1995AbstractTwo methods of estimating the size of the graptolite zooid are described and discussed. It is possible to size a zooid by reference to cortical bandages or with reference to modem Rhabdopleura and its tubes. These two methods give very different results, with the first suggesting small zooids relative to thecal size and the second suggesting ...
Susan Rigby, Margaret Sudbury
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Geological Journal, 2018
The distribution of conodonts and graptolites from the upper 13 m of the San Juan Formation and the first metre of the lower member of the Los Azules Formation, Los Gatos and Amarilla creeks, Cerro Viejo of Huaco, Central Precordillera from San Juan ...
M. Mango, G. Ortega, G. Albanesi
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The distribution of conodonts and graptolites from the upper 13 m of the San Juan Formation and the first metre of the lower member of the Los Azules Formation, Los Gatos and Amarilla creeks, Cerro Viejo of Huaco, Central Precordillera from San Juan ...
M. Mango, G. Ortega, G. Albanesi
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Geological Journal, 2018
Graptolites and conodonts are frequent fossils in Sandbian (Late Ordovician) outcrops of the Argentine Precordillera, where they present continuous and abundant records that enable detailed biostratigraphic studies.
Nicolás A. Feltes +3 more
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Graptolites and conodonts are frequent fossils in Sandbian (Late Ordovician) outcrops of the Argentine Precordillera, where they present continuous and abundant records that enable detailed biostratigraphic studies.
Nicolás A. Feltes +3 more
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Molecular taphonomy of graptolites
Journal of the Geological Society, 2006Graptolites are important fossils in Early Palaeozoic assemblages. Preserved graptolite periderm consists dominantly of an aliphatic polymer, immune to base hydrolysis. It contains no protein even though its structure, and chemical analyses of the periderm of the living relative Rhabdopleura
Gupta, NS, Briggs, DEG, Pancost, RD
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Early Devonian graptolites and graptolite biostratigraphy, Arctic Islands, Canada
Canadian Journal of Earth Sciences, 2013The Early Devonian graptolite fauna of the Arctic Islands comprises the highest species content (17 species) in the world. In spite of this richness, no new species have been recognized; instead already-existing species, scattered around the then-known continents, suggest that relatively complete cosmopolitanism held sway for graptolites.
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Geological Society, London, Special Publications, 1979
Summary Graptoloids became extinct in latest Early Devonian (Pragian) times, and dendroids in the late Carboniferous. There is insufficient information for the other six graptolite orders to suggest when they might have become extinct, so that in these cases it is impossible as yet to speculate how extinction occurred.
T. N. Koren’, R. B. Rickards
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Summary Graptoloids became extinct in latest Early Devonian (Pragian) times, and dendroids in the late Carboniferous. There is insufficient information for the other six graptolite orders to suggest when they might have become extinct, so that in these cases it is impossible as yet to speculate how extinction occurred.
T. N. Koren’, R. B. Rickards
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Mode of secretion of graptolite periderm, in normal and retiolite graptolites
Geological Society, London, Special Publications, 1986Summary The construction of graptolite periderm is discussed with particular reference to the rival extra-thecal tissue (secretion) and pterobranch (mortaring) models, and it is concluded that only the former model fits the observed structures.
D. E. B. Bates, N. H. Kirk
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