坡段组主要由砂砾屑-生屑颗粒岩组成，约占全剖面的2 / 3。它们形成于水流激荡的滩相环境。
The rocks of the Poduan Formation are mainly intraclastic bioclastic grainstones formed in turbulent and agitated bank environments, and amount to about 2/3 of total thickness of the profile.
火成岩和变质岩比较致密，通常是结晶性的，颗粒之间很少有空隙。
Igneous and metamorphic rocks are more compact, commonly crystalline, and rarely contain spaces between grains.
在分析这些岩芯时，他们发现冲击石英颗粒———带有特殊排列的微裂缝的薄片，科学家认为他们是外层空间来的物体与地球碰撞留下来的遗迹。
When they analyzed these rocks, they foundshockedquartz grains—slivers with a particular arrangement of micro cracks believed to represent the relic left by an extraterrestrial impact.
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