Hurricane Mesa
From Infogalactic: the planetary knowledge core
Hurricane Mesa (Lua error in package.lua at line 80: module 'strict' not found.) is a Utah landform near Hurricane, Utah, used for Cold War tests of rocket ejection seats for supersonic aircraft at the Hurricane Supersonic Research Site.[1] The mesa is "flat bedrock of faultless Shinarump conglomerate" 1,500 ft (460 m) above the Virgin River valley, which allowed clearance for assessment of a longer flight trajectory up from the mesa and over the cliff for the test object (e.g., the anthropoid simulator--dummy--named "Hurricane Sam") onto [1]:{{{3}}}
Currently the facility is still used to test military ejection seats for the US and Foreign Govt's.