摘要
辽东半岛寒武系发育良好,化石丰富,是研究寒武纪地层和三叶虫动物群的理想地区。笔者将下寒武统及中寒武统毛庄阶划分了7个生物带,其中新建立生物带1个,新划分出生物带2个,并与国内外有关地区进行对比。三叶虫动物群包括34个种,分属19个属和3个亚属。由于篇幅所限,本文只简要描述了带化石,新属、新种另文发表。
In the Liaodong Peninsula,the Cambrian is well developed and is particularly rich in trilobites.The trilobites include 34 species belonging to 19 genera and 3 subgenera.In this paper only zonal fossils are described.On the basis of the trilobite succession,7 biozones of Lower and early Middle Cambrian can be recognized,among which two are new.These are as follows in descending order:Middle Cambrian MaochuangianShantungaspis Zone Probowmaniella Zone Lower CambrianLungwangmiaoanWeijiaspis-Redlichia tumida Zone Bonnia Zone Redlichia nobilis Zone Redlichia murakamii Zone Tsanglangpuian Megapalaeolenus ZoneMegapalaeolenus Zone includes Megapalaeolenus fengyangensis(Chu),M.(Latim-egapalaeolenus)latilimbatus Guo et An and Redlichia(Redlichia-)jianchangensis Guo et An.This zone is widespread in North China and Southwest China.Redlichia murakamii Zone includes Redlichia(Pteroredlichia)murakamii Resser et Endo,R. (Pt.)yilongensis Hsu,R. (R.) jianchangensis Guo et An,and Cheiruroides primigenius (Saito). This zone is widely distributed in North China and Southwest China.Redlichia nobilis Zone includes Redlichia(Redlichiaynobilis Walcott,R. (Pteror-edlichia)chinensis lui Chang,Prozacanthoides virgincus Resser,Jianchangia nansha-nensis Guo et An.This zone occurs also in North China and Southwest China.Bonnia Zone includes Bonnia asiatica Qiu,Bicella laevis Nan et Chang,Jianc-hangia sp. ,Kootenia damiaoensis Qiu,Prozacanthoides fengjiatunensis (Nanet Chang), Pr. liaoningensis Nan et Chang and Tingyuania typica Sun et Chang.The Bo nnia-Tingyuania Zone in Xuzhou region is comparable to this zone. The presence of Bonnia in the Mantou Formation of the Liaodong Peninsula indicates that. this zone may be correlated with the Bonnia-Olenellus Zone of North AmericaWeijiaspis-Redlichia tumida Zone includes Austinvillia tumida Nan et Chang, Plesiamecephalus xuzhouensis Lin et Qiu,Redlichia(Redlichia)tumida Guo et An, Weijiaspis reflexa Qiu, W. houmengensis(Qiu) , W ,tongshanensis(Qiu et Lin),and others.This zone may be equivalent to the zone of Qiaotouaspis-Redlichia tumida zene in the Taizihe Valley and the zone with Qiaotouaspis of Shandong.Probowmaniella Zone includes Paragunnia bathyconica Qiu,Plesiagraulos tiens-hifuensis Endo,Probowmania(Mufushania)changi Lin,Probowmaniella jiawange-nsisChang and Pr.curta(Nan et Chang).This zone may correspond to the zone with Yaojiayuella in the North China Platform.Shantungaspis Zone includes Shantungaspis aclis(Walcott)and Ziboaspis xuz-hou enss Qiu.This zone is extensively distributed in the North Ghina platform.The Lower and early Middle Cambrian trilobite faunas in the Liaodong Peninsula are closely related to those of the Xuzhou region of northern Jiangsu. Te presence of Bonnia and Prozacanthoides in the Lower Cambrian Mantou Fo-rhmation indicates that the Early Cambrian waters of the Liaodong Peninsula were in free communication with those of North America.
