The combination of the great circle and the square, in this work, is identical with that which exists in the celebrated Circleville work,—which work, it may be observed, is no more remarkable than numbers of others, and owes its celebrity entirely to the fact, that it has been several times described with some minuteness.

Fig. 10.

A reduced plan of the Circleville work, Fig. 10, is herewith presented, which will sufficiently illustrate this remark. Its dimensions were considerably less than those of the analogous structures already described. The sides of the square measured not far from nine hundred feet in length, and the diameter of the circle was a little more than one thousand feet. The work was peculiar in having a double embankment constituting the circle. It is now almost entirely destroyed, and its features are no longer traceable.[49]

The walls of the rectangular portion of the Frankfort work, where not obliterated by the improvements of the town, are still several feet high. They were, within the recollection of many people, much higher. They are composed of clay (while the embankment of the circle is composed of gravel and loam), which, as in the case of the square work described, Plate [X], appears to have been very much burned.

The isolated mound near the upper boundary of the circle is composed entirely of clay, and is twelve feet high; the others are of gravel, the largest being no less than twenty feet in altitude. Various dug holes or pits, from which the material for the embankments and mounds was evidently taken, are indicated in the plan. Some of them are, at this time, fifteen or twenty feet deep. The subsoil at this locality, as shown by excavation, is clay. If there was no design, therefore, in constructing the walls of the square of that material, it follows that it was built last, and after the loam and gravel had been removed from the pits.

[♠]

A portion of the large circle has been encroached upon and destroyed by the p061 creek, which has since receded something over a fifth of a mile, leaving a low rich bottom intervening.