It would seem that a mass of float quartz much of which was suitable for chipped implements had been found here. It had been excavated, leaving the pile of earth and then broken up with the river pebbles which were left behind with the waste. Probably there were fairly large pieces of the material, suitable for chipped implements; that were carried away while small pieces were left lying about a pile of unsuitable material. In other words, it would seem that these specimens mark a place for the roughing out of material for chipped implements.[20] On the same side of the river, on the side of a rather low ridge or table-land overlooking it, at a point about twelve miles above its mouth, are some rock-slides. Here it is said that graves have been found. They were probably typical rock-slide graves. On a point of land perhaps fifty feet above these and a few hundred feet to the north, Master James McWhirter pointed out a grave on his farm. It was then surrounded by a ring made up of water-worn pebbles, apparently brought up from the river. He stated that an attempt had been made to excavate it which possibly accounts for the pebbles being in a circle rather than a heap over the grave. This grave was found to contain a slab of wood, shell ornaments, probably modern, and an adult skeleton, No. 12 (7), 99-4320, p. 156. [20] See p. 20. There are a number of painted pictographs on the vertical faces of the basaltic columns, facing north on the south side of the Naches River, immediately to the west of the mouth of Cowiche Creek. These are below the flume and may be reached from the top of the talus slope which has been added to by the blasting away of the rock above, during the construction of the flume. In fact, debris from this blasting has covered part of the pictographs. Some of the pictures are in red, others in white and there are combinations of the two colors.[21] Local merchants have defaced these pictographs with advertisements. [21] Further described under the subject of art on p. 119 and shown in Plates XIV-XVI.