Fort Hill, Ohio.
The next cut shows a work at Fort Hill, Ohio, which seems to unite the characters of the two classes of enclosures. It measures twenty-eight hundred by eighteen hundred feet, and is on the second terrace. The wall along the creek side is of stones and clay, four feet high: the other main walls are six feet high and thirty-five feet thick, with an exterior ditch. The walls of the square enclosure at the side are of clay, present some marks of fire, and have no ditch. Mr Squier concludes that this was a fortified town rather than a fort like many others. The walls of the enclosure shown in the following cut, on Paint Creek, Ohio, are of stone, thirteen hundred feet in circumference, and have no ditch. The heaps of stones connected with this work have been exposed to excessive heat, either perhaps by being used as fire signals, or by the burning of wooden structures which they supported. In the works at Fort Ancient, on a mesa two hundred and thirty feet above the Miami River, the embankment is four miles long in an irregular line round the circumference, and in some parts eighteen or twenty feet high. There are also some signs of artificial terraces on the river side of the hill. A line of these defensive works is found in northern Ohio, with which very few regular mounds or sacred enclosures are connected. Pidgeon states that a single line of embankment may be traced for seventeen miles, and that there are three hundred and six miles of embankment fortifications in the state. It is quite probable that these embankments originally bore palisades. They vary in height from three to thirty feet, reckoning from the bottom of the ditch; but this gives only a very imperfect idea of their original dimensions, since in some localities the height has been much more reduced by time than in others, owing to the nature of the material. In hill fortifications the ditch is usually inside the wall, but when the defences guard the approach to a terrace-point, the ditch is always on the outside. The entrances to this class of enclosures are governed by convenience of exit, accessibility of water, and facilities for defence. They are usually guarded by overlapping walls as shown in the cuts that have been presented. Several of the larger fortifications, however, have a large number of entrances, generally at regular intervals, which it is very difficult to account for.
Fort near Bourneville.
SACRED ENCLOSURES.
Other enclosures are classed as sacred, or pertaining in some way to religious rites, because no other equally satisfactory explanation of their use can be given. That they were in no sense works of defence is evident from their position, almost invariably on the most level spot that could be selected and often overlooked by neighboring elevations. Unlike the fortifications they are regular in form, the square and circle predominating and generally found in conjunction, but the ellipse, rectangle, crescent, and a great variety of other forms being frequent, and several different forms usually occurring together. A square with one or more circles is a frequent combination. The angles and curves are usually if not always perfectly accurate, and the regular, or sacred, enclosures probably outnumber by many the irregular ones, although they are of lesser extent. Enclosed areas of one to fifty acres are common. The groups are of great extent; one at Newark, Ohio, covers an area of nearly four square miles. A remarkable coincidence was noticed by Mr Squier in the dimensions of the square enclosures, five or six of these having been found at long distances from each other, which measured exactly ten hundred and eighty feet square. Circles are, as a rule, smaller than the squares with which they are connected, two hundred to two hundred and fifty feet being a common size. The largest of the enclosures, with an area of some six hundred acres, are those reported in the far west and north-west by early travelers whose reports are not confirmed.
The embankment itself differs from those already described only in being, as a rule, somewhat lower and narrower, although at Newark one is thirty feet high, and in being constructed with less exceptions without the use of stones. The material as before was taken from the surface, ditches, or from pits, which latter are often described as wells, and may in some instances have served as such.
The following cut represents a group at Liberty, Ohio, typical of a large class in the Scioto Valley. The location is on the third terrace, the embankments of earth are not over four feet high, there is no ditch, and the earth seems to have been taken exclusively from pits, which, contrary to the usual custom, are within the enclosure. The square is one of those already spoken of as agreeing exactly in dimensions with others at a distance. Additional dimensions are shown in the cut. The enclosures, both square and round, usually include several mounds. One at Mound City, square with rounded corners, covering thirteen acres, has twenty-four sacrificial mounds within its walls. At Portsmouth, there are four concentric circles, cut by four broad avenues facing, with slight variation, the cardinal points, and having a large terraced and truncated mound in the centre. The banks of one enclosure near Newark measure thirty feet in height from the bottom of the ditch; the usual height is from three to seven feet.