冀北滦平盆地大北沟组—大店子组介形类生物地层和侏罗系—白垩系界线

收稿日期: 2005-09-26

修回日期: 2005-11-27

刊出日期: 2006-03-15

Ostracod biostratigraphy of the Dabeigou and Dadianzi formations and Jurassic-Cretaceous boundary in the Luanping basin, northern Hebei, China

Received Date: 26 September 2005

Revised Date: 27 November 2005

Publish Date: 15 March 2006

摘要: 冀北滦平盆地火斗山乡张家沟大北沟组一大店子组剖面连续、出露好、沉积序列全、化石十分丰富。介形类的研究可划分为1个延限带、4个组合带和7个亚带。其中第1（Luanpingella-Torinina-Eoparacypris）组合带及所包含的1、2（Luanpingella posta-cuba和Torininaobesa）亚带，分布于大北沟组，显示了晚侏罗世晚期的特征。第Ⅱ一Ⅳ（Yanshanina-Cypridea-Rhinocypris，Cypridea-Yanshanina-Timiriasevia和Cypridea sulcata-C shanyingensis）组合带及所包含的3-7（Cypridea stenolonga，C xitaiyangpoensis，Cluanpingensis，Csulcata和Cshanyingensis）亚带分布在大店子组，Cypridea开始并相继大量出现和繁盛，明显地具有早白垩世早期的特征。故侏罗系—白垩系的界线应置于第1组合带与第Ⅱ组合带，即第2亚带与第3亚带之间。
- 侏罗系—白垩系界线介形类生物地层大北沟组大店子组冀北滦平盆地
- Jurassic-Cretaceous boundary; ostracoda; biostratigraphy; Dabeigou Formation; Dadianzi Formation; Luanpingbasin, northern Hebei