basal conglomerate

基本解释

The oil-sand deposits in this region are mainly distributed in Cretaceous sandstone and basal conglomerate.
该地区油砂主要分布于白垩系砂岩、底砾岩中。
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The long-term base-level rising cycle of sequence-2 is composed of basal braided channel sandstone-conglomerate→meandering stream→ delta;
层序2的长期基准面上升半旋回呈现由底部充填于切蚀谷的辫状河河道砂砾岩→网状河→曲流河→三角洲序列；
Vertically, rocks near the unconformity appear layers which are in turn semi-weathering rock, weathering clay bed and basal conglomerate.
不整合附近的岩层在纵向上呈层分布：从下至上依次为半风化岩石、风化粘土层和底砾岩。