Helicopter pilot Bret Hutchings found the large metal monolith while helping wildlife officers count bighorn sheep in southern Utah.
In scenes reminiscent of 2001: A Space Odyssey by Stanley Kubicks, the monolith was found alone in the desert landscape.
The helicopter pilot told local news channel KSLTV, “It’s the strangest thing I’ve encountered there in all my years of flying.”
Mr Hutchings said they had just flown directly over the monolith.
“One of the biologists is the one who spotted it and we just flew straight overhead.
“He was like, ‘Whoa, whoa, whoa, turn around, turn around! And I was like “What? And he said, ‘There’s that thing over there – we’ve got to go look at it!’ ”
Mr Hutchings said the object looked man-made and appeared to be firmly planted in the ground.
Stanley Kubrick’s 1968 film opens with prehistoric apes interacting with a large monolith in the middle of the desert.
The helicopter pilot said he suspected the Utah monolith was the work of a New Age artist.
“I guess he’s a new wave artist or something or, you know, someone who was a huge fan from 2001: A Space Odyssey fan,” he says.