Présentation de l'éditeur
By. T. M. BUSHNELL, of the U. S. Department of A griculture, In Charge, and WENDELL BARRETT, of the Indiana Department of Geology. Area Inspected by W. E. McLENDON. DESCRIPTION OF THE AREA. Porter County, I nd., is located in the northwestern corner of the State, about 40 miles from Chicago. It is bounded on the west by Lake County, on the south by Jasper County, from which it is separated by the Kankakee River, on the east by Laporte County, and on the north by Lake Mchigan. The county has an area of 415 square miles, or 265,600 acres. It is roughly rectangular in shape, with a uniform width east and west of 15 miles and a maximum length of about 34 miles, the northern and southern boundaries being irregular. Porter County has three main physiographic divisions: (1) the plain of glacial Lake Chicago, (2) the Valparaiso morainic system and associated till plains, and t3) the out wash plain and lake plain of the Kankakee Basin. The glacial Lake Chicago plain adjoins Lake Mchigan. It is about 2miles wide at the eastern boundary of the county, and 8J miles wide where it crosses the western boundary. Bays of this lake extended up Salt Creek Valley nearly to the Pennsylvania Railroad, and eastward along the Calumet River to Laporte County. The Valparaiso morainic system traverses the county in a northeast and southwest direction. It has a width of 14 miles on the western and about 10 miles on the eastern county hne. The remainder of the county, comprising the southeastern part, belongs to the Kankakee Basin. In general, the topography of the Lake Chicago Plain is level, but the surface configuration is locally varied by wind action. A long the lake front there is a continuous strip of sand dunes, which in Fig. 1. Sketch map showing location of the Porter County area, I ndiana.
(Typographical errors above are due to OCR software and don't occur in the book.)
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