[Enclosure]

Bent and shattered edges of Slaty Laminæ

The section in which these appearances occur bears no real resemblance to some which have been found in districts where traces of ice-action are absent, in England, the United States, &c. The finely laminated sand on Moel Tryfan shews no sign of having been disturbed by the percolation of rain-water or frost, while the numerous shell-fragments arranged, along with very small pebbles, in continuous layers, have probably been preserved (as Darbishire long ago suggested)³ by the clay above the sand (which last spring was about ten feet thick) preventing the downward passage of acidulated rain-water. The erratic stones on Moel Tryfan could only have been brought by ice which must have stranded on the mountain before it could have left its erratic freight; and why have recourse to any other cause for the bending and shattering of the slates, seeing that ice not only capable of accomplishing the task, but likewise of producing the wonderful associated phenomena, must at one time have been present.

(The upper limit of the bent part of the slates inclines a very little, but not the line marking the commencement of the bending, somwhat like this—)