This canyon is also called Banshee Canyon and the lava rock that comprises the walls is called rhyolite
Yes, I saw that name on the internet as well. I couldn't figure out, what is its actual name. I found three names for it:
Hole in the wall canyon
Which is the real name of the canyon? Or does it have 3 names? Do you know?
I've seen Banshee Canyon more than the other two names, but I don't know which was the first or real name.