The Indian celt no doubt fell from the topsoil while the trench in which the wall was built was being excavated.
If the topsoil is very poor, get some good, rich, black soil.
We start out in about a foot of topsoil, then some hard rock and then more hard rock.
In Brazil the best soil is known as terra roxa, a topsoil of red clay three or four feet thick with a gravel subsoil.
The prairie vole makes a tortuous network of paths through the grass and honeycombs the topsoil with its tunnels.
Bless the red-skins who bred maize, the great preserver of life and damn them for breeding maize the great destroyer of topsoil.
Place the topsoil on one side of the hole; on the other the poorer subsoil.
The topsoil and the humus may be a little mixed, but we are not going to sort them out by hand.
Now below the topsoil is a lighter coloured, less fertile, more rocky layer, the subsoil.