An Account of Observations Upon Some Geological Appearances in Glen Tilt

26th bed alluvium angle apex appear arch axis bank base Bovey Calanna Carpolithes Catania centre clay cleavage cliff compact cone crater deposit dikes direction elevated eruption escarpment Etna feet thick felspar fissures Flora Tertiaria Helvetiæ foliation formation fossil fragments fruit GEMMELLARO Giannicola Giarre glacier Glen Tilt gneiss granite granular quartz greenstone hornblende inches inclined junction LAMK lava layers leaf leaves lignite limestone Loch longitudinal lower magnified main rocks margin mass mica-slate miles millims Miocene molar Mongibello Mount Etna mountain nearly numerous observed parallel Pecopteris Pecopteris lignitum perpendicular petioles pinnules planes Plate PLATYGONUS portion posterior quartz rare ridge river Salzhausen sand schist scoriaceous scoriæ secondary nerves seeds seen Sequoia Serra side sienite sienitic greenstone slope species specimens steep stony strata stratified stretch structure substance surface tertiary transverse Trifoglietto tuffs upheaval upper Val del Bove valley veins vertical volcanic WALTERSHAUSEN yards Zafarana