[48] Trans. Geol. Soc. 1st ser. vol. ii. (1814), p. 29.
[49] Western Islands of Scotland (1819), vol. ii. p. 571.
[50] Trans. Geol. Soc. 1st ser. vol. v. (1821), p. 482.
[51] The Isle of Man (1848), chap. x.
[52] Trans. Geol. Soc. Edin. ii. (1874), p. 332.
[53] Geol. Mag. 1880, p. 4.
[54] Proc. Liverpool Geol. Soc. vol. vi. (1888-89), p. 123.
[55] Quart. Journ. Geol. Soc. xlvii. (1891), p. 432. This paper was reprinted with additions and corrections in Yn Lioar Manninagh, Douglas, Isle of Man, vol. i. No. 10, April 1892.
It may be remarked at the outset that the last outcrop of the plateau-lavas of the Solway basin occurs only 60 miles from the south end of the Isle of Man, at the foot of the hills of Galloway, the blue outline of which can be seen from that island. The distance from the Manx volcanoes to the nearest of the puys of Liddesdale is about 100 miles. Though the fragment which has been left of the ejections is too small to warrant any confident parallelism, there appears to be reason to believe that, alike in geological age and in manner of activity, the Manx volcanoes may be classed with the type of the puys.
The Carboniferous strata of the Isle of Man lie in a small trough at the south end of the island. The lowest members of the series consist of red conglomerates and sandstones, which pass upward into dark limestones full of the characteristic fossils of the Carboniferous Limestone. As the bottom of the basin is on the whole inclined seawards, the highest strata occur along the extreme southern coast. It is there that the volcanic rocks are displayed. They occupy a narrow strip less than two miles in length, which is almost entirely confined to the range of cliffs and the ledges of the foreshore. Yet though thus extremely limited in area, they have been so admirably dissected along the coast, that they furnish a singularly ample body of evidence bearing on the history of Carboniferous volcanic action.