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Updated: June 3, 2025
In fact, these minute crustaceans, almost as frequent in some of the shales as plates of mica in a micaceous sandstone, enable geologists at once to identify the Middle Purbeck in places far from the Dorsetshire cliffs, as, for example, in the Vale of Wardour in Wiltshire.
Thus we have a general character of smooth and rounded mountains; and also a distinction in that general character from the produce of the soil indicating the nature of the solid materials, as containing, either on the one hand calcareous and argillaceous substances, or, on the other, as only containing those that are micaceous and siliceous.
Far beyond its right bank rose an Ash'hab, or "grey head," which seemed to promise quartzose granite: it will prove an important feature. Before sleeping, I despatched to El-Wijh two boxes of micaceous schist and two bags of quartz, loads for a pair of camels.
Some have imagined that the age of different granites might, to a great extent, be determined by their mineral characters alone; syenite, for instance, or granite with hornblende, being more modern than common or micaceous granite. But modern investigations have proved these generalisations to have been premature.
In that case, who, in earlier times, made an useless axe-head of soft micaceous stone, and why? It could be of no practical service. On the other hand, people who had the metals might fashion a soft stone into an arme d'apparat. "It cannot have been intended for ordinary use," "the axe may have been a sacred or ceremonial one," says Mr.
On ascending the most westerly of the hills, we found it composed of micaceous schist, the upper coat of which was extremely soft, and broke with a slaty fracture, or crumbled into a sparkling dust beneath our feet. The summit of the hill was barren, and beef-wood alone grew on it.
This material of our smooth green mountains may be termed an argillaceous schistus; it has generally calcareous veins, and is often fibrous in its structure resembling wood, instead of being slatey, which it is in general. There is however another species of schistus, forming also the same sort of mountain; it is the micaceous quartzy schistus of the north of Scotland.
Above the Ghauts a plateau of primitive rocks mixed with sandstone, granite, syenite, mica schiste, quartz rock, micaceous grit, &c.
Lastly, a casting thrown up through the concrete and decayed mortar between the tiles, with which the now ruined aisle of Beaulieu Abbey had formerly been paved, was washed, so that the coarser matter alone was left. This consisted of grains of quartz, micaceous slate, other rocks, and bricks or tiles, many of them from 1/20 to 1/10 inch in diameter.
'With the micaceous crystals, corrected Fergus. 'It was off the top of that very cliff that fell down, so I am sure there must be more in it; and some one else will get them if they won't let me go and see for them. 'And Alexis White gave you leave to take it? 'Oh yes, I always ask him. 'Were you at the place when you asked him, Fergus? 'At the place on the cliff? No.
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