圆顶礁国家公园的大教堂谷，犹他州 Mesas, Upper Cathedral Valley, Capitol Reef National Park, Utah (© Tim Fitzharris/Minden Pictures)

圆顶礁国家公园的大教堂谷，犹他州 Mesas, Upper Cathedral Valley, Capitol Reef National Park, Utah (© Tim Fitzharris/Minden Pictures)

This 'reef' is nowhere near the sea…

…nor the US Capitol building it's named for. Utah's Capitol Reef National Park—first established as a national monument this day in 1937—is named for its massive rock domes that reminded explorers of that famous rotunda back in Washington, DC. Why Capitol 'Reef,' though? Because the imposing formations were a major obstacle to travelers through the region, the same way a coral reef is an obstacle to sailors.

This section of the park, Cathedral Valley, is dotted with monoliths that differ from the namesake domes, instead featuring sheer, jagged walls. While most of the park rests on a steeply warped section of Earth's crust, Cathedral Valley is relatively flat—so rather than carving out gently sloping domes, water erosion here has tended to cut deep, narrow recesses down the rock faces.

这个“暗礁”离海很远…

…也不是以它命名的美国国会大厦。犹他州国会珊瑚礁国家公园于1937年作为国家纪念碑首次建立，以其巨大的岩石圆顶命名，使探险家们想起了华盛顿特区著名的圆形大厅。但为什么国会大厦是“暗礁”？因为壮观的地形是旅行者穿越该地区的主要障碍，就像珊瑚礁是海员的障碍一样。

公园的这一部分，即大教堂谷，点缀着不同于同名圆顶的巨石，取而代之的是陡峭、参差不齐的墙壁。虽然公园的大部分都坐落在地壳急剧弯曲的部分，但大教堂山谷相对平坦，因此这里的水侵蚀倾向于沿着岩石表面切割出深而窄的凹坑，而不是雕刻出缓倾斜的圆顶。