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Updated: September 7, 2025
Geikie tells us that Herod had erected a great wall, enclosing the summit of the hill, with towers two hundred feet high at the corners, and in the space thus gained had built a grand palace, with rows of columns of a single stone apiece, halls lined with many-coloured marbles, magnificent baths, and all the details of Roman luxury, not omitting huge cisterns, barracks, and store-houses, with everything needed in case of a siege.
Geikie has since shown that there is a strong probability that this Plutonic rock may be of Miocene age, because a similar Syenite having a true granitic character in its crystallisation has modified the Tertiary volcanic rocks of Ben More, in Mull, some of which have undergone considerable metamorphism.
Sir A. Geikie has disputed the correctness of the view, which I advocated as far back as 1874, that the trachytic lavas of Antrim are the earliest products of volcanic action; but at the time he wrote his paper on the volcanic history of these islands, it was not known that pebbles of this trachyte are largely distributed amongst the ash-beds which occur in the very midst of the overlying basaltic sheets, as I shall have to explain later on.
Farrar often interprets most helpfully the essence of an incident, and Geikie furnishes a mass of illustrative material from rabbinic sources, though with less criticism than even Edersheim has used. Neither of these works, however, deals with the fundamental problems of the composition of the gospels, nor are they satisfactory on other perplexing questions, for example, the miraculous birth.
The nature of this contact, whether indicating the priority of the granophyres to the plateau-basalts or otherwise, is a matter of dispute between the two observers above named; but the circumstantial account given by Sir A. Geikie, accompanied by drawings of special sections showing this contact, appears to prove that the granophyre is the newer of the two masses of volcanic rock, and that it has been intruded amongst the basaltic-lavas at a late period in the volcanic history of these islands.
Archibald Geikie in Ayrshire have shown that some of the volcanic rocks in that county are of Permian age, and it appears highly probable that the uppermost portion of Arthur's Seat in the suburbs of Edinburgh marks the site of an eruption of the same era. Two classes of contemporaneous trap-rocks occur in the coal-field of the Forth, in Scotland.
Geikie has lately shown that a depression of 25 feet on the Forth would not lay the eastern extremity of the Roman wall at Carriden under water, and he was therefore desirous of knowing whether the western end of the same would be submerged by a similar amount of subsidence.
So the cause of the glacial epoch remained at the mercy of Lyell and Croll, although Geikie had split up the period into half-a-dozen intermittent chills in recent geology and in the northern hemisphere alone, while no geologist had ventured to assert that the glaciation of the southern hemisphere could possibly be referred to a horizon more remote.
I have used it much, in conjunction with the latest editions of Geikie, Le Conte, and Lupparent, and such recent manuals as Walther, De Launay, Suess, etc., and the geological magazines.
Maclaren and Geikie, afford evidence that at the time of the Upper Old Red Sandstone, the district to the south-west of Edinburgh was for a long while the seat of a powerful volcano, which sent out massive streams of lava and showers of ash, and continued active until well-nigh the dawn of the Carboniferous period.
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