We have a thin layer of good soil, but it turns into dense clay.
Will a Red Tipped Photinia Grow Well in Clay Soil?
Certified GKH Gardening Expert
Few plants can tolerate compacted clay soil; therefore, your best bet is to amend it. Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm