Layer upon layer of different rocks recede down into the Grand Canyon and back through time, until the strata, at the river, revealed some of the oldest exposed rocks on earth.
一层层各种各样的岩石铺叠着一直深入到峡谷之中，直至地层，追逐着时光的变迁，在河床中显露着一些地球上最古老的岩石。
Lava strata are most easily seen at the Grand Canyon of the Yellowstone, where the Yellowstone River continues to carve into the ancient lava flows.
熔岩地层是黄石公园的大峡谷中最容易看到的岩石。黄石河继续雕刻着这些古老的熔岩流。
This paper also approached the design of toe-slab that is constructed on the covering strata of river.
本文还探讨了座落在砂砾覆盖层上的趾板设计问题。
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