I am trying to rehabilitate an area of my property, approximately 1,200 square feet that was paved with asphalt. I have had the asphalt removed and left the 3” or so of gravel because it’s only a little better than the rocky orangey clay soil that’s underneath it. I have started by laying cardboard then logs, branches, sticks and now am piling wood chips on top. The log/stick layer is about 12-18". I think the finished height of the bed should be another 12" or more as the logs etc will eventually decompose and everything will shrink down. The soil on the rest of my property is only about 10” deep before the shovel meets with the rocky orangey stuff underneath which is why I’m trying to build it up with more than just the chips. (I think maybe that when it was logged in the early 20th century that some of the foresty loam may have washed down the hill.) So my question is, should I add more layers of things like manure and cardboard, (compost would be helpful but I don’t have much) or just use wood chips? Should I make more and thinner layers? I would like to plant some native shrubs, rhodos, perennials. Thanks!