Bao ancient group plans for a major deep-sea - a half deep in the ash, black ash-like TLC tuffaceous siltstone, shale tuffaceous, with gray green, with thin gray-tuff interbedded uneven.
包古图组主要为一套深海—半深海相的灰、灰黑色薄层状凝灰质粉砂岩、凝灰质泥岩，与灰绿色、灰色薄层状沉凝灰岩不均匀互层。
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。
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