This highly interesting work is situated in Butler county, Ohio, on the banks of Seven Mile creek, five miles north of the town of Hamilton. It is formed by two irregular lines of embankment, and an exterior ditch, cutting off a jutting point of the second terrace; and has an area of twenty-five acres. These embankments are parallel throughout, and were evidently both made from the same ditch. The outer one has an average height of four, the inner one of three feet. The ditch is between five and six feet deep, by thirty-five feet wide. At the southern portion of the work, both walls and the ditch have their greatest dimensions. The side of the work next the stream is bounded by an abrupt natural bank, eighteen feet high. Distant a few rods from the north-eastern angle of the work, is an elliptical mound eleven feet high; its conjugate and transverse diameters are ninety-two and one hundred and eighteen feet respectively.
This work has a single gateway thirty feet wide. The inner wall, near its southern extremity, curves inward along the terrace-bank for a considerable distance. The first, or creek terrace, is a low alluvion, not subject to overflow. It is evident, however, that the creek once ran at the base of the natural bank (now bounding one side of this work), probably at the period of its construction and occupancy.
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