Tremadocian (Ordovician) biostratigraphy and graptolites at Dayangcha (Baishan,Jilin, NE China) |
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Authors: | Email author" target="_blank">Yuandong?ZhangEmail author Bernd?-D?Erdtmann |
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Institution: | 1.Nanjing Institute of Geology and Palaeontology,Nanjing,China;2.Institut für Angewandte Geowissenschaften,Technische Universit?t Berlin,Berlin,Germany |
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Abstract: | Based on a systematic study of Tremadocian graptolites from the Early Ordovician Yehli Formation at Dayangcha, Baishan of
Jilin, NE China, a revised graptolite zonation is proposed for the Tremadocian rocks in the area. In ascending order, the
graptolite zones include theRhabdinopora flabelliformis parabola Zone, theAnisograptus matanensis Zone, thePsigraptus jacksoni Zone and theAorograptus victoriae Zone. The first three zones are discussed with their definitions and durations clarified, whereas the last zone is introduced
for the first time as a replacement of the formerAdelograptus-Clonograptus Zone. The entire Yehli Formation is considered to be older than the late Tremadocian Hunneberg Substage of Scandinavia, the
latter being represented by the carbonate-dominated basal part of the overlying Liangchiashan Formation where no graptolites
have so far been discovered. The Tremadocian succession in the Dayangcha area is regarded as being representative of the North
China (Sino-Korea) Palaeoplate, and a correlation of the Tremadocian graptolite sequence with those of other continents is
suggested.
Nine species belonging toDendrograptus, Aspidograptus, Callograptus andAirograptus of the family Dendroidae, and eight species ofPsigraptus, Adelograptus, Aorograptus andKiaerograptus of the family Anisograptidae are described and some are revised in the present paper. Among the important revisions are the
reconstructed proximal development ofPsigraptus jacksoni based on partially three-dimensional specimens from the area, and the complex thecal structures ofAspidograptus.
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Keywords: | Early Ordovician Tremadocian Graptolite biozonation Dayangcha China |
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