On the ground, there will be a low amount of clay and then gradually increased in the soil at the bottom due to leaching process leaching moving clay from now on to accumulate in soil at bottom.
The clay soil on low volume and then gradually rise in the soil at the bottom. The leaching process Moving the clay from the upper to the lower accumulation in the soil.
The surface soil is clay in low and gradually increased in the soil at the bottom. Due to process it melted. A movable clay from now on to accumulate in the soil at the bottom.