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Updated: May 8, 2025
A rather stunted rusty gum grew plentifully on the sandstone ridges; pebbles of concretionary limestone were found in the creek, probably carried down from the basalt of Phillips's Mountain; and a deposit of concretionary limestone was observed in the banks of a creek, whilst passing one of the black plains, on this side of the range.
Patrin, during his travels in the deserts of Oriental Tartary, discovered when breaking the Asiatic emerald, if fresh taken from the matrix, not only the same alternate concave and convex fractures which sometimes characterize the horizontal fissures of basaltic pillars, but also the concentric layers which denote concretionary formation: It is hardly possible to have a more striking proof of coincidence, resulting from similarity of structure, in two substances otherwise remarkably distinguished from each other.
This lava is of a pale grey colour, fusing into a black enamel; its fracture is rather earthy and concretionary; it contains olivine in small grains. The central parts of the mass are compact, or at most crenulated with a few minute cavities, and are often columnar.
We there see, that some of the thinnest layers are chiefly formed by numerous, exceedingly minute, though perfect, crystals of different minerals; that other layers are formed by the union of different kinds of concretionary globules, and that the layers thus formed, often cannot be distinguished from the ordinary feldspathic and pitchstone layers, composing a large portion of the entire mass.
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