Method for forming an irregular surface block

A method of forming a block, comprising the steps of:

• providing a cavity defined by a lower support member and one or more walls extending upwardly therefrom, with said lower support member and said one or more walls being capable of relative vertical movement therebetween;
• placing a block forming material into said cavity;
• and
• removing a block formed by said block forming material from said cavity by causing linear relative vertical movement between said support member and said one or more walls, while retaining a portion of said material in place against at least a portion of said one or more walls, to form a vertical split surface on said block where said portion of said material retained in place against at least a portion of said one or more walls is separated from the remainder of said material which remains on said support member during relative movement between said support member and said one or more walls, said split surface being oriented substantially parallel to the direction of linear relative movement between said support member and said one or more walls.