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。
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.
对声波时差异常带砂岩进行大量的铸体薄片观察，证实了本区砂岩粒间溶蚀孔隙发育，凝灰质填隙物发生了强烈溶蚀。
Cast slice of the sandstones with higher interval transit time verified that the dissolution intensity of tuff fillings took on trunk.
凝灰岩和凝灰质砂的阳离子交换容量差异显著，说明离子交换作用仅发生在粘土矿物的表面，凝灰岩中蒙脱石的层间没有发生阳离子交换。
Together with dominance of ion exchange processes in sorption indicated by sequential extraction analysis, it suggests an absence of specific sorption at sites of this kind.
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