鄂尔多斯盆地西缘桌子山地区上奥陶统拉什仲组深水复合流沉积
李向东, 陈海燕, 陈洪达

Deep-water Combined-flow Deposits of the Upper Ordovician Lashenzhong Formation in Zhuozishan Area, Western Margin of Ordos Basin
Xiangdong Li, Haiyan Chen, Hongda Chen
图3 鄂尔多斯盆地西缘桌子山地区奥陶纪深水沉积特征
(a) 拉什仲组灰绿色黏土岩夹薄层、极薄层粉砂岩;(b) 拉什仲组灰绿色薄层细砂岩底面上发育的Paleodictyon遗迹化石,经浊流侵蚀和改造;(c) 公乌素组岩性,下部为灰绿色黏土岩夹灰绿色薄层粉砂岩、细砂岩,上部为深灰色薄层石灰岩;(d) 公乌素组薄层石灰岩中的Paleodiciyon sp.遗迹化石
Fig.3 Characteristics of deep-water depoosits of Ordovician in Zhuozishan area, western margin of Ordos Basin
(a) Grayish green claystone interbedded with very thin- to thin-bedded siltstone, Lashenzhong Formation; (b) Paleodictyon trace fossils on base of grayish green thin-bedded fine-grained sandstone, eroded and reformed by a turbidity current, Lashenzhong Formation; (c) Grayish green claystone interbedded with thin-bedded siltstone and fine-grained sandstone overlay by dark gray thin-bedded limestone, Gongwusu Formation; (d) Paleodictyon sp. trace fossils in thin-bedded limestone, Gongwusu Formation