Issue 1,2000 Table of Contents

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  • 1  CRETACEOUS BIVALVES OF KANGPA GROUP SOUTH XIZANG CHINA AND THEIR BIOGEOGRAPHY
    WEN Sh-i Xuan
    2000(1):1-27.
    [Abstract](14) [HTML](0) [PDF 1.46 M](428)
    Abstract:
    In this paper42bivalve taxa including10new species recovered from the Kangpa Group of South Xizang (Tibet) are described.Most of them come from the middle and lower parts of the group which is Aptian-Albian in age and theothers from the upper part belonging to Cenomanian-Coniacian in age.The fauna of the middle and lower parts bearing endemic genera Astartoides and Yoldioides and numerous endemic species (about 61%)marks the existence of an endemiccentre.It is distinctly different from that of the area on the north of the Yarlung Zangbo River Suture Zone which shows closerelation with that of Eas Asia West Asia and Europe.In the meantime some of Australian characteristic genera such as Eyrena Maccoyella and Nototrigonia and a number of such species (about29%) are found from the middle and lower partsof the Kangpa Group which are recorded in Northern Hemisphere for the first time.This fact indicates that the Indian Subcontinent had already started its drifting northward but the drift distance should be not far from Antarctica-Australia in Aptian-Albian with the fauna of the Kangpa Group living in the north epicontinental sea of the subcontinent still could maintain the relation and exchange with that of Australian bivalves in spite of the fauna with a strong local colour.
    2  NOTES ON THE GENUS REEDOCALY MENE KOBAYASHI 1951(TRILOBITA ORDOVICIAN)
    PENG ShanChi LIN TianRui LI Yue
    2000(1):63-75.
    [Abstract](24) [HTML](0) [PDF 795.65 K](335)
    Abstract:
    For a long time the concept of Reedocalymene has been unclear because its type species was erected onpoorly preserved specimens.The abundant well preserved material of Reedocalymene expansa Yi from the Miaopo Formation of the eastern Yangtze Gorges area in western Hubei including the first recorded complete exoskeleton revealssome dorsal and ventral morphologies that were little known previously in Reedocalymene.This material allows us to revise the genus comprehensively.Some of important features of R.expansa such as facial sutures fossulae rostral plate anterior projection of cephalon and exoskeletal sculpture are discussed providing a basis for understanding the genus until more is known about the type species.At present only the type species R.unicornis and R.expansa can be assigned to Reedocalymene.The range of morphological variation and the observed differences in preservation in R.expansa suggest that all other previously described species assigned to Reedocalymene from the Miaopo Formation in theeastern Yangtze Gorges area should be suppressed as junior synonyms of R.expansa.
    3  AN EXCEPTIONALLY LARGE REPRESENTATIVE OF PERMIAN AMMONOID SHENGOCERAS FROM GUANGXI SOUTH CHINA
    ZHOU ZuRen B.F.Glenister W.M.Furnish
    2000(1):76-80.
    [Abstract](28) [HTML](0) [PDF 336.41 K](265)
    Abstract:
    An exceptionally large specimen of Permian ammonoid genus Shengoceras is reproted from Guangxi South China.T he giant size and the matured stage of the suture extend the definition of this genus and its subfamily intaxonomy of Permian cyclolobids.
    4  OCCURRENCE OF PSEUDOGLYPTAGNOSTUS (CAMBRIAN TRILOBITA)IN SOUTH KOREA AND THE SIGNIFICANCE OFTHE SLOPE BIOFACIES OF KOREA
    ZHANG Wen-Tang
    2000(1):92-99.
    [Abstract](16) [HTML](0) [PDF 358.20 K](268)
    Abstract:
    AgnostusPtychagnostus?) orientalis Kobayashi 1935from the Olenoides Zone of the Machari Formationof South Korea is a species of AgnostotesPseudoglyptagnostus) Lu 1964 which is an agnostoid trilobite of medial Late Cambrian age rather than early Middle Cambrian.Kobayashi used the Olenoides to denominate a mixed zone of trilobites of Middle and Late Cambrian ages and his5biozonations for the Machari Formation are incorrect.The occurrence of Coreolenus Cheiruroides Oryctocephalus Pagetia Tonkinella Glyptagnostus Pseudoglyptagnostus and Hedinaspis of Early to Late Cambrian age in Chunghwa North Korea and in Neietsu and Bunkei South Korea shows the presence of a slopebiofacies which should be affiliated with the North China Platform as the side facing the Pacific Ocean.This slope biofaciesin Korea was the northeast extension of the Chiangnan Belt of South China where a continuous belt of slope biofacies withsouthwest-northeast direction existed from North Vietnam via southwest Guangxi eastern Guizhou western Hunan northern Jiangxi southern Anhui western Zhejiang southern Jiangsu (including Shanghai) to Korea.This belt is continu-ous without any serious geographical displacement.It clearly shows that the North China (or Sino-Korean) and Yangtze Platforms or “Blocks” of some authors have kept their northern and southern geographical positions as shown on the presentgeographical map they probably belonged to one larger platformal area and there is no separation of the North and SouthChina Blocks during the Cambrian as many authors have indicated in different reconstruction maps for Cambrian paleogeography (e.g.Lin Fuller and Zhang 1985 Zhao and Robert 1987). Agnostus Ptychagnostus?) orientalis kobayashi and its associated species of Irvingella and Pseudagnostus are redescribed and refigured.Komaspis Kobayashi 1935may be a junior synonym of Irvingella Ulrich and Resser in Walcott 1924.Komaspis and Eochuangia are of LateCambrian Changshanian age rather than Middle Cambrian as suggested by Kobayashi in1935.

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