Re: what are these holes in these rocks?
Posted: Thu Sep 22, 2011 7:46 pm
MoapaPk wrote:Marcsoltan wrote:These look like the kind of holes left behind after a large boulder is blasted into pieces by a dynamite. I have seen holes like these on canyon walls, rock formations next to a trail, and even on creek beds. If the explosive is not pushed all the way into the hole, what's left behind is a hole that doesn't go through the rock.
So far that seems most believable-- except it is odd that one is in a boulder with rounded edges...
Good point about the round edges. I think these holes could have had sharper edges to begin with. The original edges were fairly thin, in mass and volume, and probably already fractured from the force of the blast. Then, you add weathering, rain, stream, hot, cold, etc.etc.etc. I can see, in time all the edges become rounded.