How valleys and canyons formed during Noah’s Flood by Micheal Oard Continental valleys and canyons come in all sizes and shapes. Some are V-shaped valleys, and others U-shaped canyons. Some are shallow and others have tall vertical walls, like the Grand Canyon. We rarely observe valley and canyon formation taking place today and then only in association with a flooding event. Therefore, uniformitarian1 theories about valley and canyon formation are not built on observational science but instead upon their assumptions about the past.