Just for the record, Cristo, I've dumped organic matter by tractor load on top of some of those undisturbed clay domes for a number of years. Makes beautiful surface dwelling organic soil and plants grow really well for a while. By the way, I am quite aware of the capillarity of clay soils and their nutrient exchange capacities. Oh, surprise, I even know how Fungi grow whether they are Zygomycetes, Ascomycetes, Basidiomycetes, or Fungi Imperfecti. I was employed as a biologist for 30 years in my earlier life. For certain, there is a whole world of things I don't know, but I've been around the block a few times, and I have learned a little bit during the journey.
What I've found to be true by experience with this property is that the minute I stop dumping organic
matter onto a clay site, it quickly, in a year or two, returns to its original clay dome condition. Like I had never touched it. So, in the long run, have I really changed the soil composition?
I could put a raised bed on top the clay, but if I removed it, I have a feeling that the soil underneath would still just be clay you would be poking your finger into. One may make compost in a few weeks, but that's not soil building. I don't think soil building happens in a few weeks, or even a few months. Permaculture takes years to truly amend the soil.The organic matter needs to get down into the soil, not just sit on top of it, and it takes decades for the worms and soil borrowers to mix it in naturally. Also, even with soil building plantings in place, it takes years for enough plant roots and other organic matter to permeate the soil and form a deep, rich soil even with burrowing organisms doing the mixing.