III.—The Silurian Rocks of Ireland and their Relation to the Old Red Sandstone2

^{page 65 note 3} In this paper Jukes' nomenclature is followed; the formations being called Silurian and Cambro-Silurian instead of Upper and Lower.

^{page 66 note 1} Mr. W. H. Baily has recently examined the plants from these localities in the Glengariff Grits.

^{page 66 note 2} I have since learned from Mr. O'Kelly that fossils, like plant-stems, were subsequently found in the Dingle beds.

^{page 67 note 1} Strictly, these fossils are not in the Conglomerates, but in the beds below them. As yet, in no place above the Toonnakeady Conglomerates have fossils been found, except, perhaps, in the green tuff at Mount Partry—its position, however, is uncertain.

^{page 69 note 1} Foot and myself, in about 1864, wrote a paper to show that the Minister Old Red Sandstone was in part Silurian and in part Carboniferous; the paper, however, was not published, as Jukes considered it to be premature.

^{page 72 note 1} In the Dingle Silurians, in the Toormakeady conglomerates, in the Mweelrea beds, in the Curlew rocks, and in the Fintona rocks, there are peculiar and characteristic felstones and traps that seem to be of the same age.

^{page 72 note 2} As the Continental and American geologists have found plants like Carboniferous in the Silurians, this evidence against the Silurian age of the Dingle andGlengariff beds may be considered in part at least as done away with.

^{page 72 note 3} It has been suggested that there is an uneonformable overlap of the Carboniferous Slate on the Yellow Sandstone. This, however, is perfectly impossible, for such an overlap could not exist without, in places, adding rapidly to the thickness of the Carboniferous Slate, which nowhere happens; furthermore, the Carboniferous Slate everywhere graduates downwards into the Yellow Sandstone, and the latter into the, Old Red of the Cork type.

^{page 73 note 1} Its uncertain position induced the Rev. Dr. Haughton, in the year 1863, to designate it a “Phantom formation.” —Journal Geol. Soc. Dublin, 1863.

² Read Nov. 18th, 1878, before the Royal (Geological Society of Ireland).