It is believed to be solid rock. Natives have creation story about Natives escaping bears & they clawed the rocks to climb as the Great Spirit raised them to safety. So I'm sure the nickname comes from that or the belief that it was huge & unclimbable at the time. It is like something out of Revelations.
It is the hard core of an eroded volcano. It looks spooky, thus it's name and why it was featured in Close Encounters of the Third Kind.
Research with reputable sources, not word of mouth and conjectures.
Its a old volcano
It is made up of volcanic rock
Thanks! Your answer is awaiting moderation.