Minecraft Clay generation 360

[Cat of Doom]

Hey,

I brought the X box 360 versian of minecraft a few days after launch and started my first map. Since then It has grown huge and I now have a little kngdom, But as many know, the original xbox release had no clay.

I relise that since the update it is now possible to find clay, but I have only found it on maps I started after the update.

Is their anyway to get clay on maps started pre-update

Thanks