When I bought my house, an older lady who had had it covered the backyard which is a strip 20 ft wide by 60 ft long with pea size stone so she wouldn't have to mow. When we moved in enough orgaic matter had accumulated for grass to grow in and in the 14 years since had turned into a decent yardthough the stone are still less then an inch down. Now I am seeing dead patches and the stone in that area are closer to top.Sometimes I use a grass catcher when mow so I don't get too much of a thatch build up. I relize that when I moved in the best thing I should have done was scrape the stones off and brought some topsoil in but at that time money was tight. Can I work topsoil into this yard now and if so what is the proper method? Should I do it in fall and dump alot ,level it and reseed? Is there a type of soil I should look for or an organic I should mix to it?