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It is only further to be observed, that all the arguments which have been already employed, concerning mineral concretions from a simply fluid state, or that of fusion, here take place. I have septaria of this kind, in which, besides pyrites, iron-ore, calcareous spar, and another that is ferruginous and compound, there is contained siliceous crystals; a case which is not so common.
The hill immediately over our camp was Bullabalakit, and consisted partly of granular felspar, probably tinged greenish with chlorite; and partly of concretionary porphyry, the concretions being mottled red and white, and containing grains of quartz and crystals of common felspar; the white concretions resisting the action of the atmosphere stood in relief on the weather surface; I noticed also a vein of amethystine quartz.
And this Lactescence if I may so call it, does also commonly ensue when Spirit of Wine, being Impregnated with those parts of Gums or other Vegetable Concretions, that are suppos'd to abound with Sulphureous Corpuscles, fair Water is suddenly pour'd upon the Tincture or Solution.
Scarcely a mile from Jimba we crossed Jimba Creek, and travelled over Waterloo Plains, in a N. W. direction, about eight miles, where we made our first camp at a chain of ponds. Isolated cones and ridges were seen to the N. E., and Craig Range to the eastward: the plains were without trees, richly grassed, of a black soil with frequent concretions of a marly and calcareous nature.
Again there were other concretions, irregularly formed, and composed of a hard, compact, ash- coloured stone, with an almost porcelainous fracture, adhesive to the tongue, and without any calcareous matter. These beds are, also, interlaced by many veins, containing gypsum, ferruginous matter, calcareous spar, and agate.
This seems to be due to natural causes, as there is a sharp and acid juice contained in the soil there, which imparts a sharpness to these springs as they issue from it; and so, on entering the body, they disperse all the deposits and concretions, due to the use of other waters, which they find in the body. Why such things are broken up by acid waters we can see from the following experiments.
The second expedient separates the same flux into what we call things, which are concretions in existence, complexes of qualities subsisting in space and time, having definable dynamic relations there and a traceable history. Carrying out this primitive diversity in reflection science has moved in two different directions.
The visitor should not fail to cross the Creek either above or below the Bridal Veil Falls, for on the further side are a number of water concretions well worth seeing. Mooney Falls. Mooney Falls, one mile farther down, is a much higher cataract, but the water falls in an undivided stream.
At Port Famine much of the clay-slate is calcareous, and passes either into a mudstone or into grauwacke, including odd-shaped concretions of dark argillaceous limestone. Ancyloceras simplex, d'Orbigny "Pal Franc" Mount Tarn. 2. Natica, d'Orbigny "Pal Franc" Mount Tarn. 4. Pentacrimus, d'Orbigny "Pal Franc" Mount Tarn. 5. Lucina excentrica, G.B. Sowerby, Port Famine. 6.
At Isaacs' Creek, they occur together with recent freshwater shells of species still living in the neighbouring ponds, and with marly and calcareous concretions; which induces me to suppose that these plains were covered with large sheets of water, fed probably by calcareous springs connected with the basaltic range, and that huge animals, fond of water, were living, either on the rich herbage surrounding these ponds or lakes, or browsing upon the leaves and branches of trees forming thick brushes on the slopes of the neighbouring hills.
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