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.
经历
岩作用之前，含有燧石质的胶结
。岩作用过程中，低温抵压改变
沉积物的，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.
经历岩作用之前，含有燧石质的胶结。岩作用过程中，低温抵压改变沉积物的，而后固结岩。
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