GeologyRocks

Hello All,

I was hiking in the Cascade mountains of Central Oregon the other day and while crossing a stream I saw this.  The strangest thing about it are the two flat sides which are at a almost perfect 90 degree angle.  Normally I would think that this might be man made but I was in the middle of nowhere and in the middle of a stream.  The only reason I saw it was because the sun hit one of the flat sides perfectly and caught my eye.