The farmers found the alluvial deposits at the mouth of the river very fertile.

农民条河口底下沉积物很肥沃。

Four alluvial deposits distributing along Yuanjiang river and the diamondiferous rocks that supply diamonds to these placer deposits have striking properties of varied sources and multi-phases.

沅水流域分布4个金刚石矿床，给金刚石矿含金刚石体具多期多源特点。

Mainly developed are fan - delta, deep lake turbidite and calcirudite deposit, and also alluvial fan deposit in early period.

各时期形成和粒屑灰储集体,为油气储集提了有利场所。