banded cherty iron formation

例句：

1. 1.The banded iron formation is a geological wonder that has fascinated scientists for decades.
   带状铁质岩层是地质奇观，几十年来一直吸引着科学家的注意。
2. 2. The banded iron formation is believed to be the result of intense tectonic activity in the region.
   带状铁质岩层被认为是该地区强烈构造活动的结果。
3. 3. The banded iron formation is an important source of lithium and magnesium in the Earth's crust.
   带状铁质岩层是地球地壳中锂和镁的重要来源。