Oil shale always has the accompanying relationship with overlying sedimentary tuff or other tuffaceous strata.
油页岩常与上覆沉凝灰岩或其它凝灰质岩石呈伴生关系。
The thickness of sedimentary tuff beds are small, but they are widely distributed and their extension along strike are relatively stable.
这些凝灰岩层厚度虽小，但分布较广泛，走向延伸稳定。
The sedimentary rocks are graywacke, siltstone, tuff andpellitie, etc.
沉积岩有杂砂岩、粉砂岩、凝灰岩、泥质岩等。
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