micro-cross-bedding

例句：

1. 1. The micro-cross-bedding in the sedimentary rock indicatesthat the area was once covered by ashallow sea.
   沉积岩中的微层状沉积物表明该地区曾经被浅海覆盖。
2. 2.The micro-cross-bedding isa key indicator of the geological historyof the region.
   微层状沉积物是该地区地质历史的关键指标。
3. 3. The micro-cross-bedding can be used todate the age of the rocks and determinetheir formation processes.
   微层状沉积物可以用来测定岩石的年龄，并确定它们的形成过程。