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.
在它经历岩作用之前，它有燧石质的胶结分。岩作用过程中，低温抵压改变了沉积物的分，而后固结岩。
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.
在它经历岩作用之前，它有燧石质的胶结分。岩作用过程中，低温抵压改变了沉积物的分，而后固结岩。