The depth reached by this shaft was at least 5 feet lower than at any point inside, within 200 feet of the mouth of the cave. The material, with the exception of the sand layer, was almost identical from top to bottom, there being no apparent difference other than increase of moisture in the lower part. The only explanation suggesting itself at present is that the chasm is filled with large loose rocks up to a point near the bottom of the shaft; that débris from the hillside above has covered these more rapidly than it could settle in the crevices and cavities among them; and that water which makes its way downward finds some obstruction to its free passage out at the bottom of the chasm.
The only safe plan of excavation seems to require the removal of all the earth between the side walls to a depth below the mud. If the rock bottom, or any solid bottom, is at a depth of 120 feet, there is small chance that man lived in this region at a time when it was easily accessible.
SALTPETER CAVE.--This is about 600 yards northwest of Wyandotte Cave. "The entrance, in a side of a ravine, is 5 feet high and 19 feet wide. Once within, a gigantic room expands, 220 feet long, 75 feet wide, and 10 to 30 feet in height, with smooth flat ceiling and earthen floor, the latter descending and with its edges much encumbered with fallen rock." [W.S. Blatchley.]
From the description given, this would seem an ideal site for research. Unfortunately, the bottom of the ravine is not more than 5 feet lower than the top of the talus at the entrance. This slight elevation is the only barrier which keeps the surface water from flowing in, and while the ravine seldom has any water in it, there would be enough after a moderate rain to drown out the diggers who were working below its level if the bank were removed.
LITTLE WYANDOTTE.--This, like three caves on Blue River above Wyandotte, four in the vicinity of Leavenworth, and one on the opposite side of the river in Meade County, Ky., has a small entrance in solid rock, with a steep and narrow passage to the foot of a slope which does not expand into a room of any size until at some distance beyond daylight.
The only cave of any note in Harrison County is at the King quarries, 5 miles east of Corydon. It has two outlets, one at the foot of a little cliff, through which a fine spring has an exit; the other in the face of the cliff, about 10 feet higher and a little to one side. The latter discharges more or less water after every rain. The drainage of several large sink holes is through the two openings. The owner says mud has accumulated to a depth of 3 feet on the floor within his remembrance, due to cultivation around the sink holes, which causes the soil to waste.