If the bark is indeed quickly composing, then it should be fine. The only concern would be that all that undigested carbon would consume nitrogen as it breaks down. But it sounds like it is well on its way toward becoming compost anyway, so it should be OK. If you want to help it along, though, you could dump some grass clippings on it in the spring. Or dump kitchen scraps on it through this winter. The extra nitrogen will speed up the decomposition process. Then do as you say and build walls around it and fill it with good loam.

-Diggity

Your description of that available land sounds delicious,
YUMMMM
I would love to be looking at that plot right now and deciding what I want to plant there.
You lucky Dog ;-)

Anyway,...Diggity is correct on all counts, I would simply add to his wisdom a little slice of my own.

I am not sure what you mean by "dirt" but hopefully it is some Awesome Topsoil/Compost/Organic Materials or something to that effect, that you will be proud to be adding to your plot.
Whatever you put there is going to be influencing your Gardens Growth Habits for a long time to come, you already have a most delicious start, add more wonderful consumables to that, and you will be soooo blessed.

{{gwi:9384}}

{{gwi:9385}}

Well the plan as for as soil will be to go topsoil mixed with a few different kinds of compost. Im buying a compost tumbler this year so I can keep adding to it from here on out. Hopefully in a few years I will have some really nice soil.

I cannot wait to get this started but unfortunately I still have a good 3 months before I can even thing about starting. Im slowly getting all my materials together, but if I don't get my hands dirty soon Im gonna scream.