The host rock conformably overlies a band of siliceous chertybrecia.

含矿主整合地上覆于硅质燧带之上。

This rock contained chalcedonic cement before it underwent diagenesis, a process where low temperatures and low pressures alter the content of sediments before they finally lithify, or turn into rock.

在它经历作用之前，它含有燧质的胶结分。作用过程中，低温抵压改变了沉积物的分，而后固结。