. The Quarterly journal of the Geological Society of London. X^= J. W. JUDD ON THE SECOXDARr ROCKS OF SCOTLAND. 263 The central and apical portion of the mountain of Beinn Shiant isformed of rocks of similar petrological character, which, however, areapparently of intrusive origin. On the northern side of the moun-tain these rocks form a lofty and precipitous ridge. The masses of columnar rock evidently constitute portions of anumber of lava streams which appear to have been originally inconnexion with the central mass, and to have diverged in a radialmanner from it. Some of these lava streams
. The Quarterly journal of the Geological Society of London. X^= J. W. JUDD ON THE SECOXDARr ROCKS OF SCOTLAND. 263 The central and apical portion of the mountain of Beinn Shiant isformed of rocks of similar petrological character, which, however, areapparently of intrusive origin. On the northern side of the moun-tain these rocks form a lofty and precipitous ridge. The masses of columnar rock evidently constitute portions of anumber of lava streams which appear to have been originally inconnexion with the central mass, and to have diverged in a radialmanner from it. Some of these lava streams can be traced to veryconsiderable distances. Where the grassy slopes below the lava cappings of the spurs arecut through by streams, they are seen to be composed of volcanic ag-glomerates and breccias. These contain numerous angular frag-ments of both the felspathic and basaltic lavas of earlier Tertiaryperiods with some of the underlying Lower Silurian gneiss, suchbeing the rocks upon which the mass of Beinn Shiant is built up ;mingled with these are num
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
