The Story of Rocks: A Fourteen Week's Course in Popular Geology

abundant agate ammonite ancient animal Appalachian appearance Arctic Azoic Azoic rocks beaches beautiful beds bones bowlders brachiopod called Carboniferous cave chalk clay coal color contains corals covered Cretaceous crinoids crystals débris deep deposits Describe Devonian dikes Drift earth earth's crust elephant Epoch existed feet thick feldspar fishes forests formation fossils geologist Geology glacier gneiss granite graptolites gypsum heat hills Hugh Miller hyena Ichthyosaur inches inhabitants Irish elk iron Kinds of rock land lava layers lime limestone mammals mammoth marble mass melted Mesozoic metamorphic metamorphic rocks mica miles minerals mollusks mountains Nature Niagara ocean Paleozoic pebbles Period plesiosaur polished Potsdam present quartz region remains reptiles resembled river rocky sand sandstone SCENIC sediment sedimentary rocks shales shells shore Silurian siphuncle slate soft species stone strata stratified rocks striæ Sub-kingdom surface Tertiary tion traced trees Trenton Triassic trilobite vegetation veins York