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ADJ (of animals, esp certain corals) rock-building 化石的
petrogenic
The delta deposit characterizing short basin growth time (it's mainly concentrated onto Quaternary), short lithogenous time and low lithogenous level forms an excellent accumulation condition here.
盆地发育时间短(主要集中在第四纪)、成岩时间短、成岩程度低的三角洲沉积形成了这里优越的聚集条件。
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