A Compend of Geology

abundant accumulated agencies animals Appalachian Archæan basin beds birds brachiopods called carbonate Carboniferous Cenozoic changes characteristic clay cliff coal coal-measures coast commenced condition continent coral covered Cretaceous crinoids crust Cycads deep delta deposit Devonian earth earthquake Eocene epoch erosion eruptions evident example extinct fauna feet high feet thick fishes fissures flora folded fossils Ganoids GEOL geological geysers glacial glaciers hornblende igneous interior Jurassic kinds lakes land land-surface lava lime limestone lower mammals marsupials mass Mesozoic metamorphic Miocene moraine mountain-ranges mountains nearly observed ocean organic matter origin Paleozoic period phenomena plants Plateau Pliocene present probably Quaternary reef region represented reptiles rivers sand sandstone sea-bottom sea-level sediments shells shore shore-line Silurian soil sometimes species springs square miles strata stratified rocks streams structure surface temperature Tertiary tion Triassic unconformity usually velocity volcanic volcanic island waves whole