广西玉林北均塘组腕足动物群的发现及意义

首次报道了广西玉林林木北均塘组校深水相腕足动物群。论证了其较深水相的性质；讨论了部分种的演化；建立了四个腕足生物带；简述了与笔石带的关系并进行了国际对比；确定其时代为晚洛赫柯夫－早布拉格早期，得出腕足动物集群具有快速迁移能力的结论；鱼化石的发现也为我国华南早泥盆世早期海相与陆相地层的对比提出了线索。

FIND AND SENSE OF BRACHIOPOD FAUNA IN THE BEIJUNTANG FORMATION IN YULIN, GUANGXI

A deep water brachiopod fauna of Late Lochkovian Beginning of Earlypragian was found for the first time from Zhangmu region,Yulin,Guangxi.The faunaare 35 species in 28 genera,oecuring in the Beijuntang Form.. It is recognized to beSpirigerina supramarginalis fauna. Based on the evolution of some species and thedistribution of the fauna,4 zones are reeognized(in ascending order):1.Quadrithyrinaexpansa Prodavid sonia mirabilis zone,2.Grayina magnifica guangxiensis Schizophoria sulcatina zone,3.Reticulariopsis costatus zone,4.Grayina magnificasinica zone. Zone 1 occured below the Monograptus hercynicus zone. Zone 4 containsNeomonograptus falcarius,therefore,the age of S. supramarginalis fauna is consideredto be Late Lochkovian beginning of Early Pragian. In zone 1,Qujinolepis sp.is foundto be stratigraphically below Monograptus hercyicus zone,providing an important clueto the age determination of Lianhuashan Form. which represents of marine or landdeposition. The fauna is very similar to the Quadrithyris fauna from Nevada,U. S. A.,Sprigerina fauna from Yukon in Canada,Spirigerina fauna from western NSWAustralia,as well as the brachiopod fauna from Bohemia in Czeekoslovak,etc.. Thebrachiopod fauna is recognized living in deep and quiet water on the soft substrate. Thespread rate of brachiopod species is vory quick,according to the world distribution of S.supramarginalis,G.magnifica etc.population in short time.