On the Geology of Falkland-Island

abruptly arched anticlinal appear arenaceous Australian axes of elevation axis-plane thrown beds of sandstone Berkeley Sound Captain Sulivan clay-slate and sandstone cleavage cleavage-planes close cluded coast convex curious curvature d'Orbigny DARWIN described Devonian direction dome Dome-shaped hill earthy matter earthy specks east and west eastern exposed surface Falkland Islands feet high feet in height feet in length fifty yards folded following woodcut formation formed fossil found fragment Gaudin genera highly inclined hillock horizontal imperfect inch intercalated intersected latter layers likewise line mass Messrs minor flexures mollusca Morris north northern and southern numerous observed Open fissure Orthis paleozoic parallel pasty perpendicular planes principal hill quartz ranges quartz rock remarkable right angles seams section show traces side Silurian slate south southern base species of shells Spirifer strata stratification stretching strike subordinate summit thickness thin third hill Tierra del Fuego transverse twelve feet veins vertical west range western island whilst yellowish zones