Transactions of the Royal Society of Edinburgh . in Auvergne (fig. 10). The veins or dykes seldom run far, and usually present a more or lesstortuous course. No better example of these characters can be cited than thatof the veins on the south front of the Binn of Burntisland (fig. 14). Thesevary in breadth from 5 or 6 feet to scarcely so manyinches. They bifurcate, and CARBONIFEROUS VOLCANIC ROCKS OF THE FIRTH OF FORTH BASIN. 467 rapidly disappear in the tuff, one of them ascending tortuously to near the topof the cliff. They at once recall the appearance of the well-known dykes inthe great c
Transactions of the Royal Society of Edinburgh . in Auvergne (fig. 10). The veins or dykes seldom run far, and usually present a more or lesstortuous course. No better example of these characters can be cited than thatof the veins on the south front of the Binn of Burntisland (fig. 14). Thesevary in breadth from 5 or 6 feet to scarcely so manyinches. They bifurcate, and CARBONIFEROUS VOLCANIC ROCKS OF THE FIRTH OF FORTH BASIN. 467 rapidly disappear in the tuff, one of them ascending tortuously to near the topof the cliff. They at once recall the appearance of the well-known dykes inthe great crater wall of Fig. 10.—Columnar basalt in vent at Kincraig, Fife. That many of these dykes served as lines of escape for the basalt to theouter slopes of the cone is highly probable, though denudation has usuallydestroyed the proofs of such an outflow. In some of the Fife necks a distinctradiation of the dykes from the centre of the neck is still traceable. Thisstructure is most marked on the south cone of Largo Law, where a number ofhard ribs of basalt project from the slopes of the hill. Their general trend issuch that if prolonged they would meet somewhere in the centre of the the south-east side of the hill a minor eminence, termed the Craig Kock,stands out prominently. It is oblong in shape, and like the dykes, pointstowards the centre of the cone. It consists of a compact columnar basalt, thecolumns converging from the sides towards the top of the ridge. It looks likethe fragment of a lava-current which flowed clown a gully on the outer slope ofthe cone. (B in fig. 13.) The veins of
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