NDLI: Tremadocian (Ordovician) biostratigraphy and graptolites at Dayangcha (Baishan, Jilin, NE China)

Content Provider	Springer Nature Link
Author	Zhang, Yuandong Erdtmann, Bernd D.
Copyright Year	2004
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.Auf der Grundlage einer systematischen Untersuchung der tremadocischen Graptolithen aus der unterordovizischen Yehli Formation bei Dayangcha, Kreis Baishan in der Provinz Jilin in NE China wird eine revidierte Graptolithenzonierung für die tremadocischen Schichten in diesem Gebiet vorgeschlagen. Vom älteren zum jüngeren wird die folgende Zonierung aufgestellt:Rhabdinopora flabelliformis parabola Zone,Anisograptus matanensis Zone,Psigraptus jacksoni Zone und dieAorograptus victoriae Zone. Für die ersten drei Zonen werden die Definitionen und stratigraphischen Reichweiten diskutiert und geklärt, und die oberste Zone wird neu aufgestellt als Ersatz für die vormaligeAdelograptus-Clonograptus Zone. Die gesamte Yehli Formation ist nun als älter als die spät-tremadocische Hunneberg Unterstufe anzusetzen, letztere wird als ein karbonatisch-dominierter unterer Teil der Liangchiashan Formation angesehen, in dem bislang noch keine Graptolithen entdeckt wurden. Die tremadocische Schichtenfolge im Gebiet von Dayangcha wird als repräsentativ für die Nordchinesische (Sino-Koreanische) Paläoplatte angesehen, und eine Korrelation der tremadocischen Graptolithenabfolge mit der aus anderen Kontinenten wird hiermit vorgeschlagen.Neun Arten, die zu den GattungenDendrograptus, Aspidograptus, Callograptus undAirograptus der Familie Dendroidae gehören und acht Arten der GattungenPsigraptus, Adelograptus, Aorograptus undKiaerograptus der Familie Anisograptidae werden in diesem Manuskript beschrieben und einige werden revidiert. Zu den wichtigen Revisionen gehören die Rekonstruktion der Proximalentwicklung vonPsigraptus jacksoni auf der Grundlage von teilweise dreidimensional erhaltenen Exemplaren aus diesem Gebiet sowie der komplexen Thekenstrukturen vonAspidograptus.
Starting Page	323
Ending Page	354
Page Count	32
File Format	PDF
ISSN	00310220
Journal	Paläontologische Zeitschrift
Volume Number	78
Issue Number	2
e-ISSN	12369874
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Frühes Ordovizium Tremadoc-Stufe Graptolithen Biozonation Dayangcha China Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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