| Choice of conodont Idiognathodus simulator （sensu stricto） as the event marker for the base of the global Gzhelian Stage （Upper Pennsylvanian Series,Carboniferous System） |
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| 作者姓名： | Philip H. Heckel, Aleksandr S. Alekseev, James E. Barrick, Darwin R. Boardman, Natalya V. Goreva, Tatiana N. Isakova, Tamara I. Nemyrovska, Katsumi Ueno, Elisa Villa, David M. Work |
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| 作者单位： | [1]Department of Geoscience, University of Iowa, Iowa City, Iowa 52242, USA; [2]Department of Paleontology, Geology Faculty, Moscow State University, 119992 Moscow, Russia; [3]Department of Geosciences, Texas Tech University, Lubbock, Texas 79409, USA; [4]School of Geology, Oklahoma State University, Stillwater, Oklahoma 74078, USA; [5]Geological Institute, Russian Academy of Sciences, Pyzhevsky per. 7, 110017 Moscow, Russia; [6]Institute of Geological Sciences, National Academy of Sciences of Ukraine, O. Gonchar Str. 55b, 01054 Kiev, Ukraine; [7]Department of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan; [8]Department of Geology, University of Oviedo, Arias de Velasco s/n, 33005 Oviedo, Spain; [9]Maine State Museum, 83 State House Station, Augusta, Maine 04333, USA |
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| 摘 要： | We propose that the level at which the conodont species Idiognathodus simulator （Ellison 1941） （sensu stricto） first appears be selected to mark the base of the Gzhelian Stage, because we believe that this is the optimal level by which this boundary can be correlated. This taxon has a short range and a wide distribution, as shown by correlation of glacial-eustatic cyclothems across the Kasimovian-Gzhelian boundary interval among Midcontinent North America and the Moscow and Donets basins of eastern Europe, based on scale of the cyclothems along with several aspects of biostrati- graphy. Outside of these areas, I. simulator （sensu stricto） is known also from other parts of the U.S., and is reported from the southern Urals and south-central China in its expected position between other widespread taxa. Its first appearance is consistent with the current ammonoid placement of the boundary （first appearance of Shumardites cuyleri）, and it is also compatible with certain aspects of the distribution of Eurasian fusulinid faunas （e.g., lectotype ofRauserites rossicus）.
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| 关 键 词： | 牙形石 奇颚牙形石属 模拟技术 岩石学 |
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