biostratigraphic

Jurassic Biostratigraphic Sequence in the Middle of Northern Tibet.

辽西地区白垩纪火山岩层序探讨.

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Trilobites were rapidly evolving forms and are of widespread use in biostratigraphic studies.

三叶虫是进化迅速的种型,并广泛用在生物地层学的研究上.

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