A geological surface that separates younger overlying sedimentary strata from eroded igneous or metamorphic rocks and represents a large gap in the geologic record.
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.
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。
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