Note 26 — PETER KALM’s TRAVELS.

The shores of the river now consisted no more of pure earth; but of a species of slate. They are very steep and nearly perpendicular here, and the slates of which they consist are black, with a brown cast; and divisible into thin shivers, no thicker than the back of a knife. These slates moulder as soon as they are exposed to the open air, and the shore is covered with grains of small sand, which are nothing but particles of such mouldered slates. Some of the strata run horizontal, others obliquely, dipping to the south and rising to the north, and sometimes the contrary way. Sometimes they form bendings like large semicircles: sometimes a perpendicular line cuts off the strata, to the depth of two feet; and the slates on both sides of the line from a perpendicular and smooth wall. In some places hereabouts, they find amongst the slates, a stratum about four inches thick of a grey, compact, but pretty soft limestone, of which the Indians for many centuries have made, and the French at present still make, tobacco-pipes26.