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

农民发现这条河口底下的沉积物很肥沃。

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.

域分布4个金刚砂矿床，给金刚砂矿的含金刚具多期多源特点。

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

各时期形成的砂和粒屑灰储集,为油气储集提了有利的场所。