朝鲜南部Machari组Olenoides带的Agnostus(Ptychagnostus?)orientalis Kobayashi一种应归于Agnos-totes(Pseudoglyptagnostus)Lu,1964一属 ,时代是晚寒武世长山期 ,不是早期中寒武世。小林贞一的Olenoides带是中及晚寒武世三叶虫混杂在一起的一个化石带。他建立的该组 5个化石带也有问题。Coreolenus,Cheiruroides,Pagetia,Oryctocephalus,Tonkinella,Glyptagnostus,Pseudoglyptagnostus,Hedinaspis在朝鲜北部中和及朝鲜南部闻庆、宁越等地区 ,早至晚寒武世地层内的存在 ,说明上述地区为斜坡相区。这一斜坡相区依附于华北或中朝地台边缘并向着太平洋一方。朝鲜的斜坡相区是华南江南带从越南北部经广西西部、贵州东部、湖南西部、江西北部、安徽南部、浙江西部、江苏南部(包括上海地区) ,呈东北方向伸向朝鲜。江南带是连续的 ,在地理位置上没有位移。这清楚地显示中朝地台及扬子地台(或有些作者所指的华北地块及华南地块 ) ,如现代地理图上所指的 ,仍然保持北、南的地理位置。寒武纪中朝地台及扬子地台可能属于同一个大的地台区 ,没有位移或分离的证据。Agnostus(Ptychagnostus?)orientalis Kobayashi,193 5及与其共生的Irvingella sp.,Pseudagnostus sp.3种这里作了新的记述。Komaspis Kobayashi,193 5可能是

Agnostus （Ptychagnostus？） orientalis Kobayashi 1935from the Olenoides Zone of the Machari Formationof South Korea is a species of Agnostotes （Pseudoglyptagnostus） 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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