Posted 1 Year, 2 Months ago rohandsa Expert Boarder Posts: 83   That rock was obviously used by an enraged usenet reader to bash in the skull of some idiot who posted a large image file to the wrong newsgroup. jdm The administrator has disabled public write access. Posted 1 Year, 2 Months ago Kedar Senior Boarder Posts: 76   Vicki - one well-known way formations resembling these occur is in the presence of a water current, when an eddy current bearing rock fragments creates a scouring situation. It's surprising how little time it takes. The administrator has disabled public write access.