他在华盛顿州东部瓦拉·瓦拉谷的一个大峡谷中四处探访，发现了洪水沉淀物形成的39个堆积层。
Poking around in a canyon in the walla walla valley of eastern Washington, he found 39 stacked layers of sediment deposited by water.
他在华盛顿州东部瓦拉·瓦拉谷的一个大峡谷中四处探访，发现了洪水沉淀物形成的39个堆积层。
Poking around in a canyon in the walla walla valley of eastern Washington, he found 39 stacked layers of sediment deposited by water.
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