前方不远处出现一巨石，拦住了去路，我们称为“拦路石”。如果我们仔细观察，在石头的表面会发现许多波浪状花纹，这种花纹地质上称“波痕”。这一现象的形成是在10亿年前由海浪作用，冲击那些未固结的沉积物，并在其表面留下波状起伏的痕迹，这就证明了10亿年前这里曾是一片海洋。
A boulder appeared not far ahead and blocked the way. We call it a "roadblock". If we look carefully, we will find many wavy patterns on the surface of the stone, which are geologically called "ripple marks". This gaoyaguan.89ix.comtanceqi.89ix.comxguangji.89ix.comjianceyii.89ix.comphenomenon was formed one billion years ago when waves shocked unconsolidated sediments and left undulating traces on their pvcguancai.89ix.comjinshuguan.89ix.comsurface, which proves that it was an ocean one billion years ago.