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The rock is grey sienite, and from the striking similarity of aspect, it appeared to me pretty certain that Pole, Burke, and Banks Islands are of the same formation; they agree in exhibiting massive peaks, respectively 409, 490, and 1,246 feet in height.
Other conical hills or short ranges, with irregular rugged crests, were composed of granite of many varieties, red and white, fine grained without hornblende, or containing the latter substance, and changing into sienite; and, at one place, it seemed as if it had broken through Psammite. I observed quartzite in several localities, and a hard pudding-stone extending for a considerable distance.
Sienite cropped out on the flats between these two ranges. I commanded a most extensive view from the higher range. High and singularly crenelated ranges were seen to the south-west; detached peaks and hills to the westward; short ranges and peaks to the north; and considerable ranges between north and north-east. A river was observed to join the Burdekin from the ranges to the south-west.
The river here formed a large sheet of water; large masses of a white Sienite protruded out of it, opposite the junction of the creek. The opposite bank exhibited a very perfect and instructive geological section of variously bent and lifted strata of limestone, which was afterwards found to contain innumerable fossils, particularly corals and a few bivalve shells. The Rev.
These ridges are separated by a sort of valley like a Norwegian fjord, tilled with red marl. The rocks are generally volcanic products, with much slate, which is extensively quarried. Granite and sienite are also quarried, and at the chief granite-quarry Mount Sorrel, an eminence which projects into the valley of the Soar was in former times the castle of Hugh Lupus, Earl of Chester.
I observed a fine sienite on several spots; it is of a whitish colour, and contains hornblende and mica in almost equal quantities; granite was also seen, and both rocks probably belong to each other, the presence of hornblende being local. A very hard pudding-stone crops out about nine miles down the river. From the ridges, hills were seen to the N.N.E. and to the westward.
In our granitic regions intersected by innumerable trap dikes, as, for instance, at Nahant, the smooth surface of many of the rocks, where sienite and trap have been evenly levelled, shows that the same inexorable saw, cutting alike through hard and soft materials, has passed over them.
Near the place of our first encampment on the Lynd, in lat. 17 degrees 58 minutes, I observed a sienite, to which the distribution of the hornblende in layers had given the stratified appearance of gneiss. Another rock was composed of felspar and large leaflets of white mica, or of quartz and white mica.
The red granite, black sienite, and red porphyry of Egypt, which are seen at Rome in obelisks, columns, and sarcophagi, are amongst the most durable compound stones; but the grey granites of Corsica and Elba are extremely liable to undergo alteration: the feldspar contains much alkaline matter; and the mica and schorl, much protoxide of iron.
A vast similarity of design existed in the early gravestones. Originality of inscription, carving, size, or material was evidently frowned upon as frivolous, undignified, and eccentric even disrespectful. A few of the early settlers used freestone or sienite, or a native porphyritic green stone called beech-bowlder.
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