This is the freeform feature column "page". This version allows you to mix and match any regular page stacks. Used correctly, this type of feature column allows you to create a very rich content area with template driven placement. The drawback is that design rules will not be enforced when using this type of feature column. For example, nothing would stop you from placing a 'large' image here, the result of which would be a very unattractive page as the large image would push the width of the content area to much wider than the acceptable. This page is set using the non-existant page template 'block.tmpl' and the type attribute of 'basic'