1. Mudstone is a type of sedimentary rock that is composed of fine particles of clay and silt.
泥岩是一种由细小的粘土和粉砂颗粒组成的沉积岩。

2. The layers of mudstone found in this area contain fossils from the Jurassic period.
在这个地区发现的泥岩层含有侏罗纪时期的化石。