Proceedings of the Indiana Academy of Science Volume 12-14 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...because of their bearing on the theory of ore deposits, artesian wells and drainage flumes. The fact that sand through which water is flowing, as before indicated, can be replaced by an ideal liquid having a velocity-potential which is identical with the pressure opens a new field of investigation in hydrodynamics from which many important results will be obtained. A Topographic Result Of The Allcvial Cone. An alluvial cone that is composed mainly of more ov less finely comminuted material would not last long enough after the area covered by it ceases to be one of deposition to produce an enduring topographic feature. It would soon succumb to the agents of erosion and transportation. Even if composed of coarse material, its life might be short if the lithological character and climatic conditions were such as to bring rapid disintegration. Rut if the cone be composed mainly of coarse material that can withstand the weathering agencies, there is every reason to believe that it would have lasting topographic results. In transverse section, alluvial cones are higher in the middle than on the borders next the escarpment, as shown in Fig. 1. so that the tendency is for the streams which form them to shift either to the right or to the left, running along the base of the escarpment. If such a stream is not overloaded at this point, it becomes a cutting stream, and the profile, that shown in Fig. 2. Should the cone be formed immediately below the.'unction of two streams, as in Fig 3, both streams might shift, one to either V side, leaving the cone between them, as in Fig. 4, and with the profile as shown in Fig. 5. The writer has in mind a case of this kind, where the shifting has recently taken place. In the Boone chert region of northern Arkansas, there are many...