. The Quarterly journal of the Geological Society of London. , and that their thicknessand wide extension points rather to their intrusive nature. Rocks of this character have not been observed below the quartzite to thesouth-east, between the Loch Awe and the Ardrishaig Groups, but their intrusivenature may satisfactorily account for such absence. Not only is there an absence of pyroclastic rocks in the Loch Awe basin,but the peculiar acid rocks associated with the pillow-lavas of Tayvallich arealso unrepresented, and it is probable that the Tayvallich rocks occupy ahigher horizon than those
. The Quarterly journal of the Geological Society of London. , and that their thicknessand wide extension points rather to their intrusive nature. Rocks of this character have not been observed below the quartzite to thesouth-east, between the Loch Awe and the Ardrishaig Groups, but their intrusivenature may satisfactorily account for such absence. Not only is there an absence of pyroclastic rocks in the Loch Awe basin,but the peculiar acid rocks associated with the pillow-lavas of Tayvallich arealso unrepresented, and it is probable that the Tayvallich rocks occupy ahigher horizon than those of the Loch Awe basin. Mr. Barrow congratulated the Author on the able manner inwhich he had dealt with the additional evidence afforded by thevolcanic zone on the question of the succession in the HighlandBocks. He wished that the Author had gone more fully into thehistory of the question as a whole. The quartzite was believedby the speaker to be the Highland Quartzite, which crossedScotland from Port Soy to Islay, and, as Harkness had shown, XXX i—iXh5. e .5o .§ f> ° £ 1 o s art. Javuriv. (n>(. Sec , Tl .JULX1L !53,440 ONG THE L AGGERATED.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
