Coast-road to Coquimbo-Great loads carried by the miners-Coquimbo-Earthquake-Step-formed terraces-Absence of recent deposits-Contemporaneousness of the Tertiary formations-Excursion up the valley-Road to Guasco-Deserts-Valley of Copiapó-Rain and Earthquakes-Hydrophobia-The Despoblado-Indian ruins-Probable change of climate-River-bed arched by an ea