Pabodie might have been able to tell what sort of engineering held it in place, but Danforth and I could merely admire and marvel. We could see mighty stone corbels and pillars here and there, but what we saw seemed inadequate to the function performed. The thing was excellently preserved up to the present top of the tower—a highly remarkable circumstance in view of its exposure—and its shelter had done much to protect the bizarre and disturbing cosmic sculptures on the walls.
As we stepped out into the awesome half daylight of this monstrous cylinder bottom—fifty million years old, and without doubt the most primally ancient structure ever to meet our eyes—we saw that the ramp-traversed sides stretched dizzily up to a height of fully sixty feet.
This, we recalled from our aerial survey, meant an outside glaciation of some forty feet; since the yawning gulf we had seen from the plane had been at the top of an approximately twenty-foot mound of crumbled masonry, somewhat sheltered for three fourths of its circumference by the massive curving walls of a