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Updated: May 20, 2025
Here is the source of the whin-stone which we were looking for; it is the common blue basaltes, of the same nature with the Giant's Causeway, but with no regular columner appearance. Above Oldhamstocks we again found the sand-stone in the bank, but it soon disappeared under a deep cover of gravel, and the burn then divided into several rivulets which come from the hills.
The country on its north bank down to its junction with the river 20 miles from the junction of Warroul Creek, is broken into ridges of quartz and sand-stone, stony, and poorly grassed.
Behind this again we have a natural section of those sand-stone strata, containing fragments of the schistus. After this nothing appears but the schistus rocks, until sand-stone and marl again are found at Red-heugh above the vertical strata. From that bay to Fast Castle we had nothing to observe but the schistus, which is continued without interruption to St Abb's Head.
In order to render the building substantially water-tight, it had been originally intended to make it wholly of hewn-stone built in regular courses; but the quarry of Eda being about fourteen miles distant from the works, the stones had to be conveyed by sea through rapid tides; and there being but indifferent creeks or havens, both at the quarry and at the Start Point, it was found necessary to make only the principal stones of hewn work, while the body of the work was executed in rubble building, for which excellent materials were at hand, consisting of a sort of sand-stone slate or micaceous schist.
M. de Luc observes, that in this country the schistus is generally covered by strata of lime-stone, and that these lime-stone strata are again covered with those of sand-stone, in which are found a great many fragments of schistus lying flat.
The Nottingham ale derives much of its celebrity also from the peculiar construction of the cellars, which are generally excavated out of a rock of sand-stone to a considerable depth, of a circular or conical form, with benches formed all round in the same way, and on these the barrels are placed in regular succession.
But this is only a particular stratum; and the general appearance of the sand-stone, as well as other strata in the coal countries, is that of having been little affected by those subterranean operations of heat by which those bodies in the alpine country have been changed in their structure, shape, and position.
Such figures as these are extremely common in our sand-stone strata; but this is an object which I never had distinctly observed in the alpine schisti; although, considering that the original of those schisti was strata of sand, and formed in water, there was no reason to doubt of such a thing being found.
If we strike a line to the N.W. from Sydney to Wellington Valley, we shall find that little change takes place in the geological features of the country. The sand-stone of which the first of the barrier ranges is composed, terminates a little beyond Mount York, and at Cox's River is succeeded by grey granite.
These signs of improvement, however, vanish the moment Mittagong range is crossed, and sand-stone again forms the basis of the country to a considerable distance beyond Bong-bong. At a small farm called the Ploughed Ground, it is again traversed by a dike of whinstone, and a rich but isolated spot is thus passed over.
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