. The Quarterly journal of the Geological Society of London. Quarry, Ethie. The- glomeroporphyritic aggregates contain olivine (serpentine andhaematite pseudomorphs), twinned augite, and labradorite. Felspar,granular augite, iron-oxides, and a little interstitial glass occur in the-ground-mass, which indicates flow-structure. This type is on thewhole less basic than usual. X20. 6. Amygdaloidal sandstone from a cavity iu lava east of Dunninald Den (PI. XLV, fig. 4). The finer layers of sediment appear to have broken,up while the coarser sediment was still unconsolidated. Theamygdales contain ch
. The Quarterly journal of the Geological Society of London. Quarry, Ethie. The- glomeroporphyritic aggregates contain olivine (serpentine andhaematite pseudomorphs), twinned augite, and labradorite. Felspar,granular augite, iron-oxides, and a little interstitial glass occur in the-ground-mass, which indicates flow-structure. This type is on thewhole less basic than usual. X20. 6. Amygdaloidal sandstone from a cavity iu lava east of Dunninald Den (PI. XLV, fig. 4). The finer layers of sediment appear to have broken,up while the coarser sediment was still unconsolidated. Theamygdales contain chlorite and calcite. X6. Discussion. Dr. J. W. Evans remarked on the interest of the paper and on-the clearness with which the Author had placed the facts and hisconclusions from them before the Society. It was remarkablethat the Lower Old Red Sandstone lavas of this area should be somuch more basic than of the Cheviots. The speaker was stillinclined to believe that many of the conglomerates were due ta , Quart. Journ Geol. Soc. Vol. LXIX,
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