Note 54 — THE TESTIMONY OF THE ROCKS. (continued 8)

Trees must have been very abundant in what is now Scotland in these Secondary ages. Trunks of the common Scotch fir are of scarce more frequent occurrence in our mosses than the trunks of somewhat resembling trees among the shales of the Lower Oolite of Helmsdale. On examining in that neighborhood, about ten years since, a huge heap of materials which had been collected along the sea shore for burning into lime in a temporary kiln, I found that more than three fourths of the whole consisted of fragments of coniferous wood washed out of the shale beds by the surf, and the remainder of a massive Isastrea. And only two years ago, after many kilnfuls had been gathered and burnt, his grace the Duke of Argyll found that fossil wood could still he collected by cartloads along the shore of Helmsdale. The same woods also occur at Port Gower, Kintradwell, Shandwick, and Eathie. In the Island of Eigg, too, in an Oolite deposit, locked up in trap, and whose stratigraphical relations cannot in consequence be exactly traced, great fragments of Pinites Eiggensis are so abundant, that, armed with a mattock, I have dug out of the rock, in a few minutes, specimens enough to supply a dozen of museums. In short, judging from its fossiliferous remains, it seems not improbable that old Oolitic Scotland was as densely covered with coniferous trees as the Scotland of Roman times, when the great Caledonian forest stretched northwards from the wall of Antoninus to the furthest Thule.