Lectures on Geology: Being Outlines of the Science

Actynolite alluvia alternating ammonites amygdaloidal arenaceous argillaceous argillite augit basalt beautiful beds belemnites bitumen calcareous carbonate chalk chlorite chlorite schist clay slate coal coarse color compact felspar composed compound conglomerates contains crater crystals deposits distinct earth elevated epidote feet felspar fibrous foliated formation fossils fracture fragments fresh water geological Geologists gneiss grains granite granular green greenstone grey greywacke gypsum hornblende hornblende schist Humboldt imbedded indurated ingredients iron irregular laminæ laminar lava lime limestone marble marine marl mass mentioned mica mica slate micaceous schist minerals mountains observed occasionally occur ocean oolite organic remains ostrea passes peat porphyry position primary rocks prismatic pyrites quantity quartz quartz rock Quartz sand rock salt sandstone Scaly schist schistose secondary rocks serpentine shells sienite siliceous sometimes spar species splintery stone strata structure substances surface SYNOPSIS talc tertiary texture tion transition turritella usually vallies varies varieties vegitable veins volcanoes