宁夏纳缪尔期含鱼地层新知  

A Contribution to the Knowledge of the Namurian in Ningxia

作　　者：卢立伍[1] 方晓思[1] 姬书安[1] 庞其清[2] 

机构地区：[1]中国地质博物馆 [2]石家庄经济学院,河北石家庄050031

出　　处：《地球学报》2002年第2期165-168,共4页Acta Geoscientica Sinica

基　　金：国家自然科学基金 (编号 :4980 2 0 0 1)资助

摘　　要：宁夏石炭纪纳缪尔期地层为海陆交互相 ,富含植物、海生无脊椎动物化石。在这套地层的上部首次发现了保存完整的鱼化石 ,为该套地层划分对比及沉积环境的恢复提供了新的证据。这一鱼群化石在中国石炭纪亦是首次发现。初步研究表明 ,该鱼群包括古鳕类 (palaeoniscoids)和软骨鱼类中的近似于Listracanthus化石。根据埋藏特征推断 ,这些鱼类的沉积环境为近岸滨海 ,但可能非原地沉积。建议在宁夏采用土坡组作为岩石地层单位来代表本区原定为“靖远组”和“红土洼组”的地层 。The Namurian rocks are well outcropped in Ningxia, North China. Apart from plenty of fossil insects, other invertebrates and fossil plants, a new fossil fish group was recently excavated for the first time in Zhongwei County, southern Ningxia. The fish fauna includes palaeoniscoid fish individuals, scales and some chondrichthyan Listracanthus-like dermal denticles. The ecology analysis shows that the fishes were buried in nearshore sea, but might have been transported from a different area. Stratigraphically, the name Tupo Fm. is recommended as the lithological unit for the whole rocks formerly recognized as the Namurian deposits in Ningxia, though the uppermost part of this unit might have been younger than the Namurian.

关 键 词：宁夏 纳缪尔期 含鱼层 土坡组 岩石地层 沉积环境 靖远组 

分 类 号：Q915.862[天文地球—古生物学与地层学]