了望角砂岩并不是一个单一的盖层状砂岩。
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.
实验结果表明，混合泥质砂岩导电可以看作是层状泥质和分散泥质砂岩并联导电的结果。
The experiment results show that conductance of laminated and dispersed shaly sands may be treated as parallel conductance between laminated shale and dispersed shaly sands.
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