存在于两个相连地层之间的岩石，可能在这一层是泥板岩，而在另一层中是砂岩；但存在于泥板岩或者砂岩中的化石往往都是相同的。
While rock between two consistent strata might in one place be shale and in another sandstone, the fossils in that shale or sandstone were always the same.
我们能够提供花岗岩，大理石，板岩，砂岩，石英岩，李。
We're able to provide granite, marble, SLATE, sandstone, quartzite, li.
鹅卵石、板岩、砂岩等砌成一面墙，不但高贵典雅，还显得很神秘。
Pebbles, SLATE, sandstone and brick wall, not only elegant, also appears to be very mysterious.
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