Complex sentence: Little Nescopeck Creek is mostly situated on top of the Mauch Chunk Formation, a Mississippian Period rock that consists of shale, conglomerate, and coarse gray sandstone.
Split into simpler sentences: Little Nescopeck Creek is mostly situated on top of the Mauch Chunk Formation. This rock is from the Mississippian Period and consists of shale, conglomerate, and coarse gray sandstone.