When folks refer to their mixes being 50:50 sand and peat 1/3 peat/ 1/3 LFS/1/3 sand or whatever, do they mean homogeneous mixtures or layered? What motivates this question is that in an environmental job I used to have I sometimes went on drilling crews where the soils are logged by depth. Very often there is a few inch topsoil layer, followed by silt, then clay, then sand. The transition is rarely abrupt and rarely homogeneous. Things generally transition gradually. What are bogs like? How many inches of sphagmum is on top, followed by peat. I know it varies wherever it goes, but is there a general rule of thumb?