基岩的风化产物由于山区暂时性洪流的作用,被携带到山谷出口处而形成形体如扇状的沉积物。多半见于半干旱气候区。主要由砾石、砂、粉砂和黏土物质组成。略具分选性和不清晰的层理。
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洪积扇 [地理] diluvial fan ; [地理] proluvial fan ; proluvium fan ; puluvial fan
洪积层 [地质] diluvium ; diluvial ; diluvial formation ; Qpl
洪积物 [地质] proluvium ; diluvium ; diluvial deposit ; drifted material
洪积土 diluvial soil ; pluvial soil ; overwash
前洪积世 [地质] antediluvial ; Prediluvian ; antediluvial antediluvian
洪积世 diluvial epoch ; diluvium ; diluvial age ; Pleistocene
洪积的 diluvial ; pluvial ; proluvial
洪积说 diluvial theory ; diluvial hypothesis
冲洪积 Qal ; Qpal ; Qapl
在东亚和南亚，大江的洪积平原一直是多数人口和经济活动的家园。
In South and East Asia the floodplains of great rivers have always been home to vast Numbers of people and much economic activity.
根据成因蓝宝石砂矿层分为冲积砂矿层、洪积砂矿层和残坡积砂矿层；洪积砂矿层中蓝宝石最富。
According to I ts origin, sapphire sand strata are divided into sand wash stratum, pluvial stratum and relict drifted sand stratum, while sapphire concentrated well in drifted sand stratum.
沉积物组成了山区河流冲洪积相、湖沼相的灰色含煤建造，其物质成分与基底岩石具明显继承性。
Sediments in basins consist of grey coal-bearing formation composed of fluvial alluvial, proluvial fac ies, lacustrine-swamp facies. The material composition of sedim…
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