Ripple marks, like something you'd typically see on a beach, but they're the size of sand dunes.

痕，就像你在海滩上常见那种，但它们却如同沙丘一般。

These huge ripple marks along the Columbia River near Trinidad, Washington, reveal the impact of enormous amounts of water rushing over the surface.

华盛顿特里尼蒂附近哥伦比亚河沿岸这些痕，揭示了量水流冲刷地表影响。

Geologist Skye Cooley was looking at some LIDAR in the area near Omak and found these giant current ripples.

地质学家斯凯·库利在奥马克附近地区查看激光雷达数据时，发现了这些水流痕。