In order to remove the débris a point 3 feet below the lowest spot on the floor was selected on the slope outside. From here a trench was carried in on a level, the additional depth being taken to facilitate clearing away all material that had accumulated inside the cavern in comparatively recent time, and thus lighten the task of deeper excavations should these be required. The trench needed to be only wide enough at the bottom to allow room for running a wheelbarrow, but owing to the great amount of broken rock, loosely held together by a small quantity of earth, the sides continually gave way, so that by the time it was safe to pass through the trench was 25 feet wide at the top and 24 feet deep at the mouth of the cave. The rocks were of every size from small pebbles to blocks weighing more than a ton each.

Nothing whatever of artificial character, not even a flint chip or fragment of charcoal, was unearthed until at a point 4 feet inside the farthest projecting stratum of the roof. Here was found a prehistoric stone wall whose outer side and top had been entirely concealed by débris. On the inner side the upper portion was visible, owing to the fact that the owner had gathered a quantity of loose stones to construct a wall farther down the slope. Previous to this the ancient wall was entirely covered by the detritus, and even after this partial exposure its true nature was not suspected. It was about 6 feet high, built up of rocks of various sizes and shapes loosely fitted together, earth from the outside surface being used to level up in places where the stones would not bind properly. The largest rock in the top layer weighed about 800 pounds.

The horizontal distance between the top of the wall as it was when cleared off and the corresponding portion of the cave roof was 4 feet; to the roof directly above it, about 2 feet. Apparently it had at one time entirely closed the entrance; at the western end where it abutted against the solid rock the upper portion was firmly consolidated by travertine. Directly above it, nearly 2 feet higher, a slab and some small irregular fragments were securely attached to the side and roof by the same agency. A crevice in the bedrock just at the end of the artificial wall contained several wagonloads of small rocks which had been thrown into it. These also were united into a solid mass by the travertine, all of which had been deposited by water flowing through the crevice. It does not follow that the wall was ever higher toward the opposite end than at this time. In the centuries that have elapsed since it was put up, the roof at the front of the cave, being rather thin-bedded, may have disintegrated. It was not possible to uncover the wall in shape for illustrating; portions of it continually crumbled as the looser material piled against it was removed.

From the wall inward the foreign material piled against the west side of the cave was composed almost entirely of small rocks, with scarcely any earth, and so compactly bound with travertine and stalagmite as to resist all attempts to remove it by ordinary means. On the east side—the left as the cave is entered—there was a great variation in the size of the stones; they were intermixed with much loose dry earth, and there was scarcely any "drip-formation" in the mass. The removal of all this disclosed a projection of solid rock forming a shelf from 8 to 12 feet wide, whose top was about 2 feet higher than the bottom of our trench. About 20 feet from the ancient wall the trench reached the original bottom of the cave as the latter was left by the stream to which its origin was due. This was the tough red or yellow clay, filled with water-worn stones such as appear in all gullies or ravines in this region. It contained a small quantity of stalagmitic material here and there and gradually rose until at 20 feet farther, or 40 feet from the old wall, it terminated against solid bedrock, reaching across the cave, the entire width of which at this point was 26 feet. The shelf on the left belonged to the same stratum.

This brought the work to the terminus that had been the aim from the first, namely, the lowest level of the floor, which was thus shown to be only a foot above the solid rock instead of at least 10 or 12 feet as the general appearance of the entrance and its surroundings had indicated. It was completely cleaned off as far as this was possible, but within 3 feet of the end of the trench began a mass several feet in thickness of fragmentary rocks of every size up to 20 tons or more which had fallen from the roof and were bound together by stalagmite.

Altogether, more than 300 cubic yards of material were removed. The workmen had been carefully instructed as to what the search was for, and kept a close lookout, as evidenced by the very small objects they were continually offering for inspection. It is safe to say that not a spadeful of earth missed scrutiny; but, aside from the artificial wall, the only traces of human presence were three valves of mussels, a turkey bone rudely pointed for use as a perforator, and three or four bones which seem to have been subjected to fire. Not a chip of flint or other stone showing work, no ashes or charcoal, not a piece of pottery, were discovered. If aboriginal burials were made in the cave—and the wall is almost definite proof of such fact—they are either on the floor under stalagmite or in crevices now concealed by fallen rocks.

Numerous small fragments of animal bones were found scattered singly at all depths in the material removed. Nearly every one showed marks of the teeth of rodents. According to Prof. F.A. Lucas, of the National Museum, they all belong to modern species except one tooth, which is that of the cave tapir, and (possibly) the jaw of an otter.

BLEDSOE COUNTY

College Cave.—About three-fourths of a mile west from the old Sequatchie College is a cave which was described as the largest in the county, and as the only one in which people might ever have lived. The opening is about 5 feet wide and 4 feet high; and from it comes a stream sufficient to run a mill.

No other caves could be located in this county or in the Sequatchie Valley north of it.