Bulletin - United States Geological Survey Volume 433 (Paperback)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: quadrangles and to be more extensive in the coastal-plain province to the south than in the plateau province to the north, although occurring as a broad belt along the lowland which marks the northern margin of the Casadepaga quadrangle. TOPOGRAPHY OF SOLOMON AND CASADEPAGA QUADRANGLES. BELIEF. From the general position of the quadrangles with reference to the whole of Seward Peninsula it is evident that within the Solomon- Casadepaga area the forms belong to the coastal-plain and plateau provinces. In the following paragraphs many of the descriptions will be more easily understood by reading the text and detailed topographic maps, Plates III and IV, together. These maps show all the larger features that will be described, but, since it is not always possible for one unfamiliar with topographic maps to correctly interpret them, a verbal description may be permitted in addition. The amount of relief relative to sea level or local base level is rather slight, the highest point being only a little more than 2,000 feet above the sea. Twenty per cent of the area represented on the two sheets is less than 300 feet above the sea; 35 per cent is between 300 and 600 feet; 33 per cent is between 600 and 1,000 feet, and only 12 per cent, or an area of less than 60 square miles, is more than 1,000 feet above the sea. As more than two-thirds of the area' lies between 300 and 1,000 feet, it may be described as one of rather low relief. When viewed from a distance it presents no great diversity in elevation, except between the coastal-plain and the plateau provinces. These two divisions seldom merge one into the other, there being generally a more or less abrupt transition. Thus, though the boundary may not be delineated topographically by a line, the junction may be placed within a...