Here and there upon its surface will be found remnants of the deep red residual clays, the subsoils of preglacial times.
The best of all subsoils is a dry bed of clay overlying sandstone.
The shells which lie embedded in the subsoils beneath the old coast-line are exactly those which still live in our seas.
Examine as many kinds of surface soils and subsoils as possible, also decayed leaf mould, the black soil of the woods, etc.
The effects of oxidation may be seen in the alteration of many kinds of rocks and in red and yellow colors of soils and subsoils.
It leaches soils and subsoils of their lime and other soluble minerals upon which plants depend for their food.
This compactness exists more or less in most subsoils, certainly in all through which water does not readily pass.