Flint Hills.—The flint hills of Kansas extend through the counties of Chase, Butler, Cowley, the northeast part of Greenwood, and south through the Kaw reservation where they merge into sandstone. Their summits are in Range 8 east. North of the Cottonwood river they appear to merge into the general line of the uplands. The same strata of rock probably extends through Morris and Wabaunsee counties. The name is misleading. These hills contain no strata or ledges of flint. The thin deposit of "chert," styled flint, is derived from nodules of that material occurring in the limestone rock of that locality, the superimposed layers having weathered away, leaving the indestructible flint nodules on the surface. In the Walnut river above Arkansas City are large beds of this broken flint, washed down from the hills in time of flood. In the Kaw reservation, on the summit of the hills, are ancient quarries where some primitive people obtained flint nodules from which to make arrow heads, spears and knives. To the west there is no stone in Kansas suitable for the purpose.