National Geographic : 1902 Aug
TOPOGRAPHIC WORK OF the summit of the Cascades and the headwaters of the White and Cowlitz Rivers, flowing to the west, and of the American, Bumping, and Tieton Rivers, tributaries of the Natches and Yakima Rivers. Mr Sylvester's principal assist ant will be Mr Ralph Cowgill. All the work in the western section is a continuation of the systematic sur vey, begun several years ago, of the for ested areas of the Cascade Mountains. Oregon.- Topographic work under the direction of Mr Richard U. Goode, geographer, will be continued in Oregon in two localities-one in the eastern por tion of the state, in the vicinity of Baker City, and the other west of the Cascades, in the vicinity of Riddles. The party operating in eastern Oregon will be in charge of Mr C. F. Urquhart, his principal assistant being Mr R. B. Robertson, and will outfit at Baker City. The work will be an extension of the existing triangulation eastward and northward into Union and Wallowa Counties, the object being to provide starting points for future topographic work, which will extend through the forested areas and mining districts. The party will commence work about July i, and remain in the field as long as the weather conditions are such that work can be prosecuted in the mountains. In western Oregon one party will be under the charge of Mr A. B. Searle, and will commence operations in the vicinity of Glendale. The work will be in continuation of that commenced dur ing the past field season, and will result in the completion of the Riddles quad rangle, comprising an area of about 900 square miles. This region is noted for its various mineral deposits, the exam ination and study of which by Mr J. H. Diller, geologist, will follow upon the completion of the topographic map. Another party, under Mr C. H. Sem per, will be engaged in carrying a line of primary levels from a tidal connec tion at Benicia, California, along the GEOLOGICAL SURVEY 327 line of the Northern Pacific Railroad as far northward toward Portland as avail able funds will permit of. Iron bench mark posts, on which will be stamped the elevation above sea-level to the nearest foot, will be established at all prominent points and at intervals not exceeding three miles. These levels will furnish a main trunk line, from which other lines of levels will ulti mately branch into the territory to the east and west of the state line, thus furnishing the vertical control for future topographic work California.-Underthe general direc tion of Mr Richard U. Goode, geogra pher, topographic work will be prose cuted in various localities in California during the coming field season. In the northern portion of the state a special map will be made of the Keswick min eral region, including an area of about 30 square miles. A portion of this area is included in the Redding quadrangle, which has been recently surveyed on the scaleof about two miles to the inch. The special work will be on the scale of about one mile equal to three inches, the large scale being necessary to a proper study of the geologic questions involved in this important district. The party engaged in this work will be in charge of Mr A. B. Searle. In the central portion of the state two parties will operate, the areas to be sur veyed being within or adjacent to the Sierra Forest Reserve. One of the par ties will be under the charge of Mr R. B. Marshall, who will have as his princi pal assistants Messrs George R. Davis and L. D. Ryus. The party will outfit at Fresno, and will complete the survey of the Kaiser Peak quadrangle com menced during the previous season, which includes the upper portion of the San Joaquin River. This party will also extend spirit levels so as to afford verti cal control for future topographic work in the Mount Silliman and Kings River Canyon region.