阶地面
阶地面-
坡间水深1500～4000m之间为宽阔的由玄武岩质火山岩构成的阶地面，其上有浊流沉积。
The area where the water depth is between 1500m and 4000m is a broader terrace area composed of basaltic volcanic rock , and there are turbidity sediments on it .
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低山麓面和阶地面上的组成物质是红色砂、粘土砾石和红色土。
The low piedmont surface and the terrace are composed with red sand , clay gravel and red soil .
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但不少研究资料表明，它向山地内部延伸，逐渐以喇叭口状收缩与河流谷地内的第三级阶地面相连。
But some studies show that it extends into the mountain land , shrinks to the shape of trumpet to link up with the third terrace in the river valley .