On the hill over the cave are three cairns, but they have been so searched through that scarcely a stone remains in its proper place. There is also the site of a flint-working industry, a space 40 or 50 feet across being strewn with spalls, flakes, and chips.
When, in addition to the sustenance provided by deer and other large game, there is taken into consideration the great numbers of wild fowls which frequented the rugged hills and numerous streams; the multitude of small mammals which found security in the myriad cavities and crevices in the cliffs; the abundant food supply in the river; and the further fact that so many mortars and pestles meant the utilization of nuts and the cultivation of corn and no doubt of other foodstuffs as well; it is apparent that the problem of mere subsistence was one with which the natives had but little need to concern themselves. That full recognition was accorded to these advantages is amply attested by the great quantity of flints found everywhere in the vicinity, the numerous workshops on the hills and in the bottoms where the ground is thickly strewn with débris in every stage from the intact nodule or block to the finished implement, and the amount of refuse not only in this cavern, but in the Saltpeter Cave in the same bluff and in the Freeman or Ramsey Cave 3 miles down the river on the opposite side. Miller's Cave, however, possesses an additional advantage, one probably not to be found elsewhere. This is the absolute security of its inmates from the attack of an enemy. The mouth of the cave is in the face of a perpendicular bluff, the wall on either side so smooth that not even a squirrel can obtain a foothold. The upper stratum of the precipice projects to such an extent that a rope or a ladder let down from above would fall several feet beyond the outer edge of the floor. Below, there is a vertical drop of 30 feet to the top of the rough talus which is as steep as rocks and earth will lie. If an assailant, by approaching from either side, should reach the foot of this bluff he would offer a fair target for stones rolled or hurled down by defenders who are safely out of reach of missiles from any direction.
The only means of entrance is a small opening in the west wall, communicating with another cave. This is so restricted in size as to permit the passage of only one person at a time, and he must assume a crawling or crouching posture. This opening, which for distinction will be called the doorway, has its top, sides, and bottom coated with stalagmite formation; so it may once have been somewhat larger than at present. The limited amount of the deposit over the natural rock at either end of the orifice is evidence, however, that it could never have been high enough for a man to walk through without stooping, or wide enough for two persons to pass each other; consequently one man armed with a club or other weapon could easily guard it against any number who might attempt to enter.