经XRD证实永城煤矸石是砂质泥岩。
The fact that coal mine refuse of Yongcheng is sandy mudstone was confirmed by XRD.
其早期形成的固城组以砾岩为主，夹含砾砂岩及砂质泥岩。
Gucheng formation which is the early deposit of Guanzhuang group is composed mainly of conglomerate rock with conglomerate-bearing sandstone and sandy mudstone.
一般而言，泥质砂岩、砂质泥岩的波阻抗值较大，泥岩波阻抗值较小，而砂岩介于两者之间。
Generally, values of wave impedance in argillaceous sandstone and sandy mudstone are relatively large, while that in mudstone is relatively small, and that in sandstone is situated between the two.
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