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廊固盆地下第三系粒级递变砂岩，系浊流在流动体制下的沉积结果，在其沉积过程中逐渐向牵引流转化。大多数浊流在刚一出现牵引流或出现牵引流之后不久就结束了其沉积史。浊流具有流动速度快、搬运距离短、沉积速度快、持续时间不长的特点。
The Lower Triassic graded graded sandstone in the Langgu basin is the sedimentation result of the turbidity flow under the flow regime and gradually transforms into the traction flow during deposition. Most turbidity currents ended their deposition shortly after the onset of traction or the occurrence of traction. Turbid flow with fast flow, short handling distance, deposition speed, duration is not long.