Notes on the Effect Produced by the Ancient Glaciers of Carnarvonshire

abrupt projecting Abstract of Dr amphitheatre of Lake Ancient Glaciers angular and rounded angular block appear argillaceous ascended Ashley Heath Bangor beds Bethesda blocks of rock boss-formed rocks Buckland Caernarvon Capel-Curig central valleys chalk-flints ciers conical deeply scored descended descent of glaciers face of rock feet in thickness floating ice foreign rock formed rocks four feet square Geological Society Glaciers of Caernarvonshire greenstone hill icebergs irregularly Lake Idwell large block layers of coarse linear ridges little mounds Llanberis mammillated marks Moel Faban Moel Tryfan mounds of detritus mountain mountain-sides Murchison's North Wales number observed Ogwyn parallel striæ passage of glaciers pebbles and boulders Phænomena Phil red sandstone remarkable scattered sea-shells slate-rocks sloping smooth Staffordshire stands isolated steep stratified gravel summit surface is jagged terminal moraine Tierra del Fuego transported on floating Trimmer Tryfan and Faban unstratified upper valley of Nant-Francon valleys of Snowdonia worn into bosses