内蒙西部银根-额济纳盆地群是在 前古生代基底上发育起来的中、新生代“叠 置型”盆地群。
Yingen-Ejina Basins in the west of Nei Mongol is shown by superposition of Mesozoic and Cainozoic on basement of pre-Palaeozoic constitutes.
下面所列举的是分布于分流和三角洲前绿砂体的油气田的例子，在地质时代上从晚古生代至中新生代。
The following examples of oil and gas fields in distributary and delta- fringe sand bodies range in age from late paleozoic to middle cenozoic.
在晚古生代岛弧带、弧前海沟带、弧后盆地或陆缘活动带等构造环境下发育有不同的火山岩组合。
Under the tectonic backgrounds of island arc belt, fore - arc trench belt, back - arc basin, and epicontinental active belt of late Paleozoic, it has different volcanic rock characteristics.
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