We pass through the hollow, and, reaching the farther edge of the bastion, towards the east, see a new range of prospect opening before us. There is first a long unbroken wall of precipice,--a continuation of the tall rampart overhead,--relieved along its irregular upper line by the blue sky. We mark the talus widening at its base, and expanding, as on the shores of the Bay of Laig, into an irregular grassy platform, that, sinking midway into a ditch-like hollow, rises again towards the sea, and presents to the waves a perpendicular precipice of redstone. The sinking sun shone brightly this evening; and the warm hues of the precipice, which bears the name of _Ru-Stoir_,--the Red Head,--strikingly contrasted with the pale and dark tints of the alternating basalts and sandstones in the taller cliff behind. The ditch-like hollow, which seems to indicate the line of a fault, cuts off this red headland from all the other rocks of the island, from which it appears to differ as considerably in texture as in hue. It consists mainly of thick beds of a pale red stone, which M'Culloch regarded as a trap, and which, intercalated with here and there a thin band of shale, and presenting not a few of the mineralogical appearances of what geologists of the school of the late Mr. Cunningham term Primary Old Red Sandstone, in some cases has been laid down as a deposit of Old Red proper, abutting in the line of a fault on the neighboring Oolites and basalts. In the geological map which I carried with me,--not one of high authority however,--I found it actually colored as a patch of this ancient system. The Old Red Sandstone is largely developed in the neighboring island of Rum, in the line of which the _Ru-Stoir_ seems to have a more direct bearing than any of the other deposits of Eigg; and yet the conclusion regarding this red headland merely adds one proof more to the many furnished already, of the inadequacy of mineralogical testimony, when taken in evidence regarding the eras of the geologist. The hard red beds of _Ru-Stoir_ belong, as I was fortunate enough this evening to ascertain, not to the ages of the Coccosteus and Pterichthys, but to the far later ages of the Plesiosaurus and the fossil crocodile. I found them associated with more reptilian remains, of a character more unequivocal than have been yet exhibited by any other deposit in Scotland.