George St. Clair, Buried Cities and Bible Countries
“ The Hills and Valleys.—Sir Charles Warren was the first to point out the necessity of ascertaining the depth of the rock below the present surface, in as many places as possible, and of referring all the measurements to one fixed datum, the level of the sea. In the study of the ancient topography the original appearance of the ground is the first consideration, for although a certain amount of soil may always have existed, still the ancient surface must have conformed far more closely to that of the rock than does the present. ”
