名 称：波痕

特 征：为水流作用形成波状起伏的层面构造，常用来指示碎屑岩层的上层面。岩石为石英岩，主要矿物为石英。

层 位：长城系书记沟组

采集地点：内蒙古固阳县阿塔山

Name：Ripple Mark

Characteristics：Waving bedding marks formed by water flow, could be used as indicator of the hanging beds of clastic sedimentary rocks. This sample is quartzite, consisting mostly of quartz.

Srtatigraphy：Shujigou Formation, Changcheng System.

Sample site：Atashan, Guyang, Inner Mongolia.