Hurricane Mesa
Hurricane Mesa 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. The mesa is "flat bedrock of faultless Shinarump conglomerate" 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.
Currently the facility is still used to test military ejection seats for the US and Foreign Govt's.
