制造这些高级工具的材料中并没有能与当地的硅结砾岩地表岩层相匹配的。
None of the material used to make these advanced tools matched local silcrete outcrops.
在这儿他们似乎消失了而且很难见到，这是因为他们生活在地表岩层落叶下面，他们将在这里度过3年的生命。
Here they seem to disappear and are rarely seen, living in rocky outcrops and under fallen tree branches and debris on the forest floor for the first three years of their life.
"从人们开始对地表的特殊岩层进行编目和分类时起，大家就开始期望能够以某种方式利用这些岩层来计算地质年代。
Ever since people had begun to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate geological time.
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