... fundamental rock 基底岩 fundamental series 基底岩系；基系 fundamental structural unit 基本结构单位 ...
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含煤岩系基底 undedying strata of coal measures
Conclusion: As the basement rock series, the Longshan rock groupand the Qinling rock group have the very similar above character, although they have the different distribution of location, and conclude that they are the same rock group.
结论:作为基底岩系的陇山(岩)群与秦岭(岩)群，虽然在空间位置上分布不同，但却有着相同(似)的以上特征，有可能说明两者为同一岩系。
参考来源 - 甘肃天水地区的陇山（岩）群与秦岭（岩）群的对比·2,447,543篇论文数据，部分数据来源于NoteExpress
变质相由基底岩系的低角闪岩相—高绿片岩相逐渐过渡为上覆盖层的低绿片岩相。
The metamorphic facies gradually change from low amphibolite—high green-schist facies of the basement to low green-schist of the cover.
成矿物质主要来源于基底太古界变质岩系。
The metallogenic substance mainly comes from the Archeozoic metamorphic rock series in basement.
盆地的基底是前寒武系变质岩。
Precambrian metamorphic rocks constituted the basin basement.
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