There are pictures in the WOC Superthread, one right at the current last page...sorry, I don't have any to post, but I have been in the area recently.
The tiers are not sloped - a better description might be terraced. Think of the area as a kind of long rectangle. Divide the rectangle horizontally into (I think) four sections. Starting at the top, a long flat area; walk down several steps and you are on the next terrace; walk down several more steps and you are at the next section, etc etc. I'm trying to remember, but each terrace is perhaps 10 feet wide? And looong. Till you get to the bottom which is wider.
HTH