As cement, authigenic mineral or vein, dawsonite is found not only in Marine dolomite and oil shale, but also in terrigenous fragmentary rock and coal measures.
片钠铝石作为胶结物、自生矿物或脉体，不仅分布在海相白云岩、油页岩中，而且还广泛分布在陆源碎屑岩及煤系地层中。
When the base of the basin subsided quickly with marine invasion, oil shale was deposited.
当盆地基底沉降速率较快、发生海侵时，主要为油页岩沉积时期；
When the base of the basin subsided quickly with marine invasion, oil shale was deposited.
当盆地基底沉降速率较快、发生海侵时，主要为油页岩沉积时期；
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