Xidashan Formation is a upward shallowing sedimentary sequence, whose sedimentary environment changed from bathyal environment to fore-platform slope.
西大山组是一个向上变浅的沉积序列，沉积环境由次深海过渡为台前斜坡；
At other hand, the golden content of the sandstone is higher than that of fine grain siltstone and mudstone, and tends to decrease and stabilize upward in the turbidite sequence.
另外，砂质单元金含量比细粒的粉砂岩和泥岩要高，从浊积岩序列的底部旋回至上部回金的含量降低并由不稳定到稳定等规律。
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