. The Quarterly journal of the Geological Society of London. h highly vesicular epidiorites in the neighbourhoodof Loch Awe. After describing a typical development of these rocksnear Inverliver, he adds : — Mr. Teall has pointed out the resemblance of these unaltered rocks to thevolcanic accompaniments of the Lower Silurian radiolarian cherts in the Southof Scotland and elsewhere. [S, p. 42.] Dr. Flett has of late greatly added to the significance of thiscomparison of Dr. Tealls, for he lias extended it to include thelava-types of the western region already mentioned [17, pp. 50-56],and also o
. The Quarterly journal of the Geological Society of London. h highly vesicular epidiorites in the neighbourhoodof Loch Awe. After describing a typical development of these rocksnear Inverliver, he adds : — Mr. Teall has pointed out the resemblance of these unaltered rocks to thevolcanic accompaniments of the Lower Silurian radiolarian cherts in the Southof Scotland and elsewhere. [S, p. 42.] Dr. Flett has of late greatly added to the significance of thiscomparison of Dr. Tealls, for he lias extended it to include thelava-types of the western region already mentioned [17, pp. 50-56],and also of the Tayvallich country itself [18, pp. 84-90 ; see also19]. Dr. Flett has furthermore expressed the opinion that thecoarsely - crystalline intrusive epidiorites must be regarded as Yol. 69.] LOCH AWE SYSTCLINE (ARGYLLSHIRE). 285 genetically connected with the lavaform varieties. This conclusionis likely to meet with fairly general acceptance in regard to the Fig. 1.—Pillow-lava, Rudha Barain, western slwre of Loch Awe,1 mile east of Inverliver. /* l-. §1 I l [The pillow showing concentrically-arranged vesicles measures 1 foot inlength by 9 inches in breadth. The interspaces between the pillows areoccupied by sandy slate.] majority of the intrusions, hut it will be readily understood thatpenological comparison of metamorphic igneous rocks inter se is a 286 MB. E. B. BAILEY ON THE June 1913, peculiarly difficult field of research, and that the results obtainedare often merely tentative. I may complete this notice, of the accounts so far published of?what I take to be the Tayvallich volcanic zone, with a reference toanother porphyritic epidiorite, which resembles a deformed pillowy lava in which theinterspaces between the pillows have been infilled with sediment. This last I found in 1905 on the shores of Loch nam Ban, eastof Loch Sween [15, p. 92]. Farther north, along the same line ofstrike, vesicular epidiorites had previously been met -with byMr. Hill and Dr. Peach, and
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