All work, so far, had been carried on at a level a few inches below the bottom of the talus, which rested directly upon the floor of clay washed out from the interior of the cave.
Beginning next at the outer end of the trench, the entire space included in the first excavation was deepened by a little more than 6 feet, giving a new floor about 13 feet lower than the highest part of the talus. All the material thus removed showed that it was laid down by flowing water, sometimes so quiet as to deposit clay of impalpable fineness, sometimes with a velocity sufficient to carry stones weighing 3 or 4 pounds. The material varied—red clay, now jointed, was the topmost layer; below it, in patches and layers, were dark earth, resembling soil; clay of different shades of yellow, brown, red, and gray, sometimes almost blue; some of it uniform, some of it mingled, one or any or all of the different sorts in small compass; deposits of one sort filling sharply defined channels or potholes cut in some other sort; occasionally there was a slight admixture of sand. All included limestone pebbles, which were plentiful in some deposits but entirely absent from others, were weathered to a chalky consistency, the larger ones to a depth of perhaps half an inch, the smaller ones throughout. Scarcely any chert was included, although it is abundant on the hill; the few pieces seen were very small.
It took five weeks of steady work, with two men, to clear out the second level. In all this clay there was not the slightest trace of bone or other indication that living beings of any kind had existed either in the cave or in any place from which the clay had come.
At 24 feet from the eastern side of the trench, projections on the face of the east wall denoted that bed rock was not far away. A hole 8 feet across, at the rear of the excavation, reached sand with a slight admixture of clay a few inches under the level at which the work was being conducted; and 4 feet down, or 17 feet from the top of the talus, the rock was found. It was rough and furrowed, like a solid stratum that has been long exposed to atmospheric weathering.
Further exploration was useless. The sand results from disintegration of the Roubidoux sandstone belonging next above the limestone in which the cave was formed. None of this remains on the hill; it has all been carried away by erosion. There is not now any sink hole or crevice above the level of the cavern through which the sand could have made its way. Such an opening must have existed at one time, on the slope at one side or the other, or farther back where the hill is now cut off. In either case, erosion has carried away its walls and filled up the channel leading from it, and thus obliterated its site. To accomplish this would require a long time; enough to produce a considerable alteration in the topography, and so to predicate for the bottom deposits in the cave an antiquity far beyond the possible appearance of man in the region.
PHILLIPS CAVE
The Phillips Cave faces Roubidoux Creek near the Big Spring, a mile south of Waynesville. Access to the interior is possible only by crawling some distance on wet clay. Other caves in the same line of bluffs are either very small or almost inaccessible. No refuse appears about any of them.
BELL'S CAVE (18)
In the upper part of the bluff bordering Roubidoux Creek just west of Waynesville, on the farm of Robert A. Bell, are numerous caves, most of them quite small. One, much larger than any of the others, has an entrance 27 feet wide and 12 feet high. The floor is of earth mingled with small rocks, and rises gradually toward the rear until at 70 feet it almost reaches the roof, although the open space enlarges farther in. The width of the cave varies from 19 to 32 feet. Several large rocks have fallen from the roof and walls at a comparatively recent date, as they lie directly upon the earth or are only slightly imbedded in it.
Shells and flint flakes occur in small amount, but the cave is so difficult of access that it was probably but little used.