Occasionally we found a small boulder of hard stone embedded in the wall.
The most unique feature of this cave, however, is the cupola-shaped structure which stands in an open space in front of the house group, near the mouth of the cave, but still under its roof.

Its height, measured inside, is twelve feet, and its widest inside diameter is eleven feet.

Its walls average eight inches in thickness.

It has one aperture three feet wide at the top, another one of the same dimension near the base, and there are several others nearly opposite each other.

In the two upper ones are seen distinct impressions of timber in the plaster.
The building was made by twisting long grass into a compact cable and laying it up, one round upon another.