Upper Mesa Falls
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Upper Mesa Falls is a waterfall on the Henrys Fork in the Caribou-Targhee National Forest. Upstream from Lower Mesa Falls, it is roughly Script error: No such module "convert". away from Ashton, Idaho.[1]
Upper Mesa Falls is roughly Script error: No such module "convert". high and Script error: No such module "convert". wide.[2]
Formation
Mesa Falls Tuff, which is the rock over which Upper Mesa Falls cascades, was formed 1.3 million years ago. A cycle of rhyolitic volcanism from the Henrys Fork caldera deposited a thick layer of rock and ash across the area.[3] This layer compressed and hardened over time.
Between 200,000 and 600,000 years ago, the river eroded a wide canyon which was subsequently partly filled with basalt lava flows. The Henrys Fork of the Snake River then carved the channel through the basalt; which is the inner canyon seen today.
See also
References
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External links
- Mesa Falls Visitor Center (USDA Forest Service - Caribou-Targhee National Forest)
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