河谷沉积物的成因实质上与河流形成的历史相联系。
The genesis of valley deposits is intimately associated with the history of the stream by which they were formed.
本文从地质构造、岩石结构、地貌、湖底形态及室内沉积物分析资料几个方面论证了喀纳斯湖的成因。
This article proves the genesis of Kanasi lake from the respects of geologic structure, landforms, formation of lake bottom and analysis material of sediments in laboratory.
对江苏海州湾近岸海区的表层沉积物进行孢粉分析，总结该研究区的孢粉分布规律及成因。
The sporopollen distribution and its formation causes in the Haizhou Bay are discussed on the basis of sporopollen analysis of surface sediment.
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