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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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Xinjiang China
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Junggar (1)
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Middle East
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Iran
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Elburz (1)
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South America
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Bolivia (1)
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United States
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Nevada
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Clark County Nevada (1)
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fossils
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Invertebrata
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Echinodermata
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Crinozoa
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Blastoidea (1)
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Crinoidea (4)
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Echinozoa
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Echinoidea (1)
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geologic age
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Paleozoic
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Bird Spring Formation (1)
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
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Lower Mississippian
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Tournaisian (1)
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Devonian
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Upper Devonian
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Famennian (2)
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Frasnian (1)
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Permian
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Lower Permian (1)
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Primary terms
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Asia
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Far East
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China
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Xinjiang China
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Junggar (1)
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Middle East
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Iran
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Elburz (1)
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biogeography (1)
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Invertebrata
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Echinodermata
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Crinozoa
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Blastoidea (1)
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Crinoidea (4)
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Echinozoa
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Echinoidea (1)
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Paleozoic
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Bird Spring Formation (1)
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
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Lower Mississippian
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Tournaisian (1)
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Devonian
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Upper Devonian
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Famennian (2)
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Frasnian (1)
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Permian
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Lower Permian (1)
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South America
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Bolivia (1)
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United States
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Nevada
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Clark County Nevada (1)
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Bridgerocrinus
A QUADRUPLING OF FAMENNIAN PELMATOZOAN DIVERSITY: NEW LATE DEVONIAN BLASTOIDS AND CRINOIDS FROM NORTHWEST CHINA
LATE DEVONIAN AND EARLY MISSISSIPPIAN ECHINODERMS FROM CENTRAL AND NORTHERN IRAN
Figure 3 — 1–4, Hexacrinites persiaensis n. sp.; A-ray, oral, posterior,...
Figure 9 — 1–2 , Athabascocrinus orientalis n. sp.; holotype, NIGP127988...
Figure 12 — 1–4 , Athabascocrinus orientalis ; 1 , 2 , holotype, NIGP12...
NEW PERMIAN CRINOIDS FROM THE BATTLESHIP WASH PATCH REEF IN SOUTHERN NEVADA
Abstract Critical to understanding long-term trends in diversity is a dataset that is both worldwide in scope and based on a sound taxonomic foundation. In this paper we re-evaluate the Famennian (Late Devonian) echinoderm dataset, which has changed radically in the past decade, and reinterpret patterns of Late Devonian echinoderm extinction and rebound based on these new data. Historically, Famennian (Late Devonian) and earliest Carboniferous echinoderms have been poorly known on a global basis leading to interpretations of prolonged rebound from the Devonian extinction events. Recent discoveries of abundant and diverse Famennian echinoderm faunas from northwestern China, Colorado, Australia and Iran, together with re-examination of previously known echinoderm faunas from Germany and England, have altered drastically our understanding of the patterns of extinction and rebound of Famennian and earliest Carboniferous echinoderm communities. Overall, Famennian echinoderm diversity at the generic level is nearly five times greater than reported in the 2002 Sepkoski compilation, and familial level diversity is more than seven times greater than previously thought. Despite the increases in diversity, Famennian echinoderm faunas show a reduced diversity of camerate crinoids that typify both Middle Devonian and Lower Mississippian faunas and portend the rise of cladid crinoid diversity later in the Carboniferous. Individual Famennian faunas are numerically dominated by blastoids, which also portends trends seen at various times later in the Palaeozoic. In general, we are able to recognize the following trends. Rebound from the Late Devonian extinction events in echinoderms was more rapid than previously thought, but seems to be concentrated in Asia. Palaeogeographically Famennian echinoderms can be grouped into two broad regions: one includes China, Australia and Iran, all of which bordered the Palaeotethys; the other includes regions from Laurussia (Europe and North America) and northern Africa (Morocco).
Crinoids from the Lower (Pragian–Emsian) and Middle (early Eifelian) Devonian of Bolivia (Icla and Belén formations, Malvinokaffric Realm)
Abstract The Late Devonian, Famennian, Hongguleleng Formation of northwestern China has yielded one of the most diverse echinoderm faunas known from China. New collections and re-evaluation of earlier collections results in recognition of new taxa, increases the known diversity, provides new morphological information on some of the previously reported taxa, and provides new information on the affinity of the Late Devonian echinoderms of the Hongguleleng Formation. New crinoid taxa introduced are Gnarycrinus lanei n. gen., n. sp., Anamesocrinus tieni n. sp., Histocrinus ? chenae n. sp., Eumhacrinus tribrachiatus n. gen., n. sp., Sostronocrinus aberratus n. sp. and Labrocrinus granulatus n. gen., n. sp. One new species of blastoid, Hadroblastus liaoi , n. sp. is described. Previous reports listed 46 echinoderms from the Hongguleleng Formation, including 13 blastoids and 33 crinoids. An additional 11 crinoid species bring the total crinoids to 44 species assigned to 32 genera. Similarly, the one additional species of blastoid brings the totals to 14 species assigned to 12 genera. The new echinoderms described herein include the first report of a dimerocrinitid, amphoracrinid, allagacrinid, glossocrinid, histocrinid, cercidiocrinid, dactylocrinid and neoschismatid from the Devonian of northwestern China. Additional morphologic information is provided for three of the previously described taxa and a revision of species assigned to Grabauicrinus is proposed. The crinoids and blastoids suggest closer affinity with Mississippian faunas than with Devonian faunas, and with North American faunas than European faunas. Collectively the blastoid and crinoid faunas from the Hongguleleng indicate that rediversification happened rapidly after extinction in contrast to current suggestions of a long interval of lowered origination following these extinction events.
Carboniferous crinoids
Abstract During the Carboniferous, crinoids were commonly so abundant that their skeletal ossicles formed limestones termed encrinites. Major evolutionary changes occurred within the Camerata and Articuliformes, as the former were displaced by the latter as the dominant clade. Both the Mississippian and the Pennsylvanian subperiods started with high evolutionary rates and ended with low evolutionary rates associated with glaciation. Although not typically used for biostratigraphy, crown-based crinoid genera can be used as biostratigraphic indicators for Carboniferous stages. Paleozoic crinoid biodiversity reached its maximum during the Carboniferous, from which there are numerous well-documented localities with high biodiversity. Faunas from the palaeobiogeographical regions of Laurussia, Palaeo-Tethys and Gondwana are reviewed. For Mississippian crinoids, 37 genera are designated as biostratigraphically useful; and, for the Pennsylvanian, 44 genera are identified. Recognition of the utility of these genera for biostratigraphy is important for dating crinoid deposits, which may be devoid of other biostratigraphically useful fossils, and add to our overall ability to delineate the temporal resolution of life on Earth.