摘要
焦作地区太原组为一套海陆交互相沉积。含灰岩8～11层。灰岩中含有丰富的牙形刺化石。笔者在刘庄西北沟剖面太原组九层灰岩中获得牙形刺7属16种。其中台型牙形刺占主要地位。其次为复合型。该区太原组牙形刺组合为:Streptognathodus elongatus-Strep.wabaunsensis-Strep.gracilis 一个组合。根据 Streptognathodus 属各种的共生关系的不同,可进一步划为三个亚组合。上述组合可与华北的太原西山、陵川、徐州、禹县等地及新疆地区相应层位的牙形刺组合进行对比。还可与北美阿帕拉契亚山脉中段等地及苏联莫斯科近郊等地相应层位的牙形刺组合(带)进行对比。
The deposits of Taiyuan formation from Jiaozuo district is charac- terized by marine carbonates intercalated with non-marine clastic sediments and consist of 8-11 beds of limestones. The limestones contain abundant Conodonts.Seven general and sixteen species of Conodonts have been recognized.Most of them are plate forms and the mixed forms come to the next in abundance. One Conodonts association named as Streptognathodus elongatus- Strep.wabaunsensis-Strep.gracilis was suggested in this paper. The association could be further divided into three subassociations according to the features of various Species of Genera Strepto- gnathodus and their associational relationship. The above Conodonts associations may be correlated with what findings in Western Hill of Taiyuan,Lingchuan,Xuzhou Yuxian county and Xinjiang at the same age and also could be compared with that found in the middle part of Appalachian Mountains in North America as well as the suburbs of Moscow in related horizons.
关键词
太原组
牙形刺
化石
组合特征
Taiyuan Formation
Conodont
Fossilassemblage
