Characteristic vocalization heard by hunter on Hayden Mountain witnessed in Ouray County, Colorado

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This incident was a scream we heard on the opening day of archery dear and elk season in Western Colorado. My hunting partner and I had left our camp before dawn to make the final climb into Fall Creek basin from just below the mouth of the basin (approximately 300 yards) After hunting the basin we exited out the mouth of the basin and instead of returning to our camp we headed north to the next basin over, Thistledown Creek. From the dark timber near our camp, we were now approximately 500 yards away and a couple hundred feet higher in elevation. An extemely loud blood curdling scream lasting several seconds boomed out from the direction of our camp. There clearly was nothing between our position and the dark timber where our camp was located. Yet the scream was unbelievably loud. It happened just once. After gaining control of our senses, we concluded it must have been a mountain lion. I talked to a few hunting guides I know who specialize in hunting mountain lions. None of them c...