Audio File   AGE OF THE ELEPHANT AND THE HORSE Land elevation and sea segregation were slowly changing the world’s weather, gradually cooling it, but the climate was still mild. Sequoias and magnolias grew in [More]
Audio File    THE FERN-FOREST CARBONIFEROUS PERIOD         THE AGE OF FROGS   The appearance of fish during the preceding period marks the apex of marine-life evolution. From this point, onward the evolution [More]