schist

The jagged stratification of Jedburgh, so different than the smooth schist-and-sandstone layering seen elsewhere in Scotland, would provide it..而赫顿不整合结构正好佐证了这种观点，这处位于杰德堡的交错岩层完全不同于在苏格兰其他地区所发现的光滑片岩和砂岩层结构。

Below are two more striking varieties of schist ..下面是两个比较突出的品种片岩。

That suit of schist contans a large number of abundant aluminium mineral: staurolite, almandine and biotite, so the primitive is mostly clayrock..该套片岩主要由富铝矿物十字石、铁铝榴石和大量黑云母组成，因而其原岩以粘土岩为主。

[地]片岩英释中释na type of rock that naturally breaks apart into thin flat pieces

mica schist,云母片岩