meanwhile, magma pushing up from beneath the surface tilted the cake up toward the west, reexposing the long-buried sediments and the often datable ash.
同时,从地下喷出的巖浆让整块地区向西边倾斜,使埋藏多年的沉积层和用来确定年代的火山灰暴露了出来。
family trees based on dna can be given precise dates at all their branch points if a few datable fossils of the right age are available.
只要一些能够确定年代的化石,便能确定以dna为基础的族谱表上所有分支点的精确时间。
all you need to do is drag and drop download components from the palette to the datable column.
您所需要做的全部事情就是从面板中拖放下载组件到数据表列。
the lubaka tuff does not contain minerals that can be dated radiometrically—but not far below it was datable material of a different kind.