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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Morocco (1)
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Primary terms
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Africa
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Morocco (1)
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Arctic region
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Greenland
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Northern Greenland (2)
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Peary Land (2)
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Asia
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Far East
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China
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Guizhou China (1)
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Hubei China
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Yichang China (1)
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palynomorphs
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South America
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stratigraphy (1)
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Barakella
A review of the Ordovician acritarch genus Barakella Cramer & Díez 1977
Peri-Gondwanan acritarchs from the Ordovician of the Llanos Orientales Basin, Colombia
Idealized line drawings of some distinctive heteropolar ‘diacrodian’ acrita...
NINADIACRODIUM : A NEW LATE CAMBRIAN ACRITARCH GENUS AND INDEX FOSSIL
Specimens of selected taxa from the Ordovician of the Paisa-1 well, Llanos ...
Morphological variability of peteinoid acritarchs from the Middle Ordovician of Öland, Sweden, and implications for acritarch classification
Advances and problems in Ordovician palynology of England and Wales
Very large acritarchs from the Furongian (upper Cambrian) rocks of the Holy Cross Mountains, central Poland
Dr. Gordon D. Wood II, 1949–2015
Morphometric analysis of Skiagia -plexus acritarchs from the early Cambrian of North Greenland: toward a meaningful evaluation of phenotypic plasticity
Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity
Abstract Two remarkable events in the history of life on the Earth occur during the Ordovician Period (486.9–443.1 Ma). The first is an exceptionally rapid and sustained radiation of marine life known as the ‘Great Ordovician Biodiversification Event’ (GOBE), and the second is a catastrophic Late Ordovician mass extinction (LOME). Understanding the duration, rate and magnitude of these events requires an increasingly precise global correlation framework. In this chapter we review the major subdivisions of the Ordovician System, their Global Stratotype Section and Points, and the chronostratigraphic levels that define their bases. We also present a detailed set of correlation charts that illustrate the relationships between most of the regional graptolite, conodont and chitinozoan successions across the world.
Abstract Early to mid Palaeozoic marine phytoplankton are represented by acritarchs and associated forms, which had a global distribution from the early Cambrian to the early Carboniferous (Mississippian). Palaeozoic phytoplankton assemblages show varying degrees of cosmopolitanism and endemism through time. A high degree of cosmopolitanism was evidently characteristic of the Cambrian and much of the Late Ordovician, Silurian and Devonian, but provincialism was more marked in the Early Ordovician and Hirnantian (latest Ordovician), the latter at a time of major palaeoenvironmental perturbations. Distribution patterns of Palaeozoic phytoplankton are attributed to a number of interacting factors, including palaeolatitude, palaeotemperature, oceanic circulation patterns, the disposition of continents, differentiation between oceanic and cratonic (distal–proximal) assemblages, and sedimentary environments and facies. There are indications that biogeographical ranges of taxa shift over time. Moving our understanding of Palaeozoic phytoplankton biogeography forward requires (1) targeted investigation of regions and time periods for which no or little data exist, (2) quantitative analysis of data to investigate how similarity between regions varies through time and how this might correlate with other datasets such as carbon isotope stratigraphy or sea-level, and (3) rigorous application of well-defined time slices to compare coeval assemblages, at least within the limits of resolution.
Regional synthesis of the Ordovician geology and stratigraphy of China
Abstract China presently comprises several independent tectonic palaeoplates or terranes and parts of other blocks, which have been assembled over geological time. In the Ordovician, these blocks included South China, North China, Tarim, Qaidam, Junggar, Qiangtang-Qamdo, Lhasa and partially Himalaya, Sibumasu and Indochina, as well as the Altay-Xing'an and Songpan-Garze fold belts, which were discrete but near-adjacent. Twelve stratigraphic megaregions bounded by tectonic sutures or major fault zones can be recognized. Some of them are further differentiated into several regions according to the lithological and biotic facies or distinct stratigraphic sequences. Here, the palaeontologic features and biostratigraphic framework of these stratigraphic megaregions and regions are summarized. The unified biostratigraphic framework presented herein is supported by 33 graptolite biozones and 27 conodont biozones, together with supplementary biozones, communities or associations of brachiopods, trilobites, cephalopods, chitinozoans, acritarchs and radiolarians. With constraints of integrative chronostratigraphy, biostratigraphy, chemostratigraphy, cyclostratigraphy and magnetostratigraphy, along with some geochronologic data, our understanding of the temporal and spatial distribution of the Ordovician lithostratigraphic units on these major blocks has been significantly advanced. Vast amounts of new data accumulated in recent decades also constrain the major Ordovician geological and biotic events evident in China, such as marine anoxia, faunal turnovers and tectonic orogenies.