The shift in emphasis from the use of macrofossils to microfossils for zonation, caused by oil exploration, has already been noted.
由石油勘探引起的划带重点化石已经显然由大化石转移到微体化石。
The shift in emphasis from the use of macrofossils to microfossils for zonation, caused by oil exploration, has already been noted.
由石油勘探引起的划带重点化石已经显然由大化石转移到微体化石。
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