辽东复州湾中石炭世地层兼论华北地台中石炭统的划分

华北地台中石炭统本溪组一般仅代表中石炭世晚期沉积。从已知的几十个海陆交互相本溪组剖面来看,其中（虫筳）类生物群为Fusulina-Fusulinella带;牙形石生物群为Idtognathodus magnificus-Ⅰ.claviformis-Neognathodus ruondyi带,在整个华北地台均可依此进行对比。但在辽东半岛南缘的复州湾一带,中石炭世沉积特征却恰好与本溪剖面相反,下部层段以灰岩为主,上部层段以碎屑岩为主。下部含6层灰岩,（虫筳）类以Profusulinella的丰富种群为特征,可建立Profusulinella带,并可进而划分为3个亚带。牙形石则为Idiognathoides sinuatus-Ⅰ.corrugatus-Declinognathodus lateralis带。复州湾含灰岩为主的下部层段和本溪含碎屑岩为主的下部层段对比,依前者之生物组合建立本溪组下部复州湾段（c21）,代表华北地台中石炭世早期沉积;复州湾以碎屑岩为主的上部层段和本溪含5层灰岩的上部层段对比,依后者之生物组合限定为本溪组上部牛毛岭段（c22）,代表华北地台中石炭世晚期沉积。

THE MIDDLE CARBONIFEROUS OF FUZHOUWAN FROM EASTERN LIAONING AND A DIYISION ON THE MIDDLE CARBONIFEROUS OF THE NORTH CHINA PLATEORM

AbstractGenerally, the Benxi Formation of the Middle Carboniferous Series in the North China Platform only represents the later Middle Carboniferous deposits According to dozens of sections of trasitional facies Benxi Formation, the author studied fusulinids and conodonts, and established Fusulina-Fusulinella zone and 1diognathodus magnificus- Claviformis-eognathodus roundyi zone, so the correlation can be done in the whole North China Platform. But in Fuzhouwan of the south margin of the eastern Liaoning peninsula, the Middle Carboniferous Strata which may be compared with the section of the Benxi Formation, Possess some opposi'e depositional characteristics. The lower part consists mainly oflimestone, and the upper part clastic stone. The lower part contains six layers of limestone. Fusulinids are represented by abundant Profusutinelta, and Profusulinelja zone can be further divided into three subzones. Conodonts are represented by /diognathoides sinuatus-I. corrugatus-eclinognathodus lateralis zone. Correlating the lower part containing mainly limestone in Fuzhouwan with the lower part containing mainly clastic stone in Benxi, and the Fuzhouwan section in the lower part of the Benxi Formation is established according to the former biotic assemblages, and it represents the earlier Middle Carboniferous deposits in the North China Platform. The upper part containing mainly clasic stone in Fuzhouwan may be correlated with the upper part containing five layers of limestone, Niumaoling section in the upper part of the Benxi Formation is limited according to the latter biotic assemblages, and represents the later Middle Carboniferous deposits in the North China Platform.