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.
在它经历成岩作用之前,它含有燧石质的胶结成分。成岩作用

,低温抵
改变了

的成分,而后固结成岩。
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.
在它经历成岩作用之前,它含有燧石质的胶结成分。成岩作用

,低温抵
改变了

的成分,而后固结成岩。
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