论文部分内容阅读
广州龙归盆地古新世介形类化石全部来自全取芯钻井剖面,据42口钻井1000个样品统计,发现介形类16属40种,本文描述其中15属39种。龙归盆地古新世介形类动物群以Cypris,Sinocypris,Cyprois,Li mnocythere四属分布最广、最常见,归属Sinocypris动物群,据其纵向分布规律,划分3个化石带,自下而上为:Ⅰ.Cypris con-cina带;Ⅱ.Sinocypris curtovata带;Ⅲ.Cyprois reniformis带。作者认为Ⅰ带的莘庄村组的时代属古新世早期,Ⅱ带的(土布)心组为古新世中期,Ⅲ带的宝月组为古新世晚期。
All of the Paleozoic mesogenic fossils in the Longgui Basin of Guangzhou come from the fully coring drilling section. According to the statistics of 1000 samples of 42 wells, there are 40 species belonging to 16 genera and 40 genera belonging to 15 genera and 39 species. The Paragonocene mesozoites in the Longgui Basin are the most widely distributed and most commonly found in the genera Cypris, Sinocypris, Cyprois and Li mnocythere. They belong to Sinocypris fauna. According to their longitudinal distribution, they are divided into three fossil zones: bottom-up As follows: Ⅰ.Cypris con-cina zone; Ⅱ.Sinocypris curtovata zone; Ⅲ.Cyprois reniformis zone. The authors believe that the age of Xinzhuangcun Formation Ⅰ in the belt Ⅰ belonged to the early Paleocene, and that of the Ⅱ zone was in the mid-Paleocene. The Pao-Yue Formation in zone Ⅲ was late Paleocene.