分隔较年轻的上覆沉积地层与火成岩或变质岩的侵蚀面的地质界面，在地质记录上代表一个大的间断。
A geological surface that separates younger overlying sedimentary strata from eroded igneous or metamorphic rocks and represents a large gap in the geologic record.
然而，黄土高原中部大多数剖面由于沉积速率较低(特别是S1地层)，加上后期强烈的成壤作用和淋溶作用可能影响其气候记录。
But, low sedimentary rate in many profiles, especially in S1, and following strong pedogenesis and eluviation would have effect on those climate records.
米兰柯维奇旋回在地质历史时期具有相对的稳定性，其在地层中的记录可以作为一座精确的“沉积物钟”和辅助的测龄工具。
The Milankovitch cycle, whose records in strata can be considered both as an accurate "sediment clock" and as an auxiliary dating tool, is relatively stable in the geologic history.
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