A large portion of these mounds, as has already been stated, are unstratified, and each was probably thrown up and completed at one time; yet skeletons are found at various depths in some of these, as, for example, one opened by Mr. Middleton, in Vernon County, a vertical section of which is shown in [Fig. 6], a a indicating the original surface of the ground and the stars the positions of the skeletons, some of which were stretched out at full length while others were folded. The heads were towards different points of the compass and the bones of all were so much decayed that none could be preserved. Several instances of this kind were observed, in some cases those skeletons near the surface or top of the mound indicating burial after contact with the whites.
It is apparent, therefore, that although some of the burial mounds of this district must be attributed to the so-called mound-builders, others were certainly built by the Indians found inhabiting it at the advent of the whites. There can scarcely be a doubt that some of the small unstratified tumuli described are the work of the Indians. If this is conceded there would seem to be no halting place short of attributing all of this class in this district to the same race.
Dr. Hoy's statement that in some cases there was evidence that the bodies had been "covered with a bark or log roofing," is in exact accord with a well-known burial custom of some of the tribes of the Northwest.
According to Mr. M. B. Kent, the Sacs and Foxes, who formerly resided in the region now under consideration, buried the body "in a grave made about 2½ feet deep, which was laid always with the head towards the east, the burial taking place as soon after death as possible. The grave was prepared by putting bark in the bottom of it before the corpse was deposited, a plank covering made and secured some distance above the body."
Another method followed by the same people, according to Mr. J. W. Spencer[8], was to make a shallow hole in the ground, setting the body in it up to the waist, so that most of the body was above the ground. A trench was then dug about the grave, in which pickets were planted. But the usual method was to place split pieces of wood about three feet long over the body, meeting at the top in the form of a roof, on which dirt was thrown to keep them in place.
According to Potherie[9], the Iroquois were accustomed to cover the bodies, after being deposited in the "fosse," with bark of trees, on which they cast earth and stones.
According to Schoolcraft[10], the Mohawks of New York—
make a large round hole in which the body can be placed upright or upon its haunches: which after the body is placed in it is covered with timber to support the earth which they lay over, and thereby keep the body from being pressed. They then raise the earth in a round hill over it.[11]
The burial customs of northern tribes, known to have occupied portions of the effigy mound district, agree so exactly with what we see in the sepulchral tumuli of this district as to justify the conclusion reached by Dr. Lapham, after a long and careful personal study of them, that they are to be attributed to Indians. Some he was rather inclined to ascribe to tribes which had migrated, had been driven off by other tribes, or been incorporated into them previous to the advent of the white race. But he maintained that the subsequent tribes or those found occupying the country "continued the practice of mound-building so far as to erect a circular or conical tumulus over their dead." And he adds significantly, "This practice appears to be a remnant of ancient customs that connects the mound-builders with the present tribes."[12]
The evidence in regard to these unstratified mounds appears to lead directly to the conclusion that they are all the work of the Indians found occupying the country at the time it was first visited by whites or of their ancestors. If it is conceded that the small unstratified tumuli are in part the work of these aborigines, there would seem to be no escape from the conclusion that all the burial mounds of this district are to be ascribed to them; for, although there are some two or three types of burial and burial mounds, the gradation from one to the other is so complete as to leave no marked line of distinction, and Dr. Lapham is fully justified in asserting that the evidence connects the mound-builders with the modern Indians. The stratified mounds in which the hard clay or mortar covering over the remains is found, and which we shall again meet with in the adjoining district, may be the work of different tribes from those which constructed the small unstratified tumuli, but the distinctions between the two classes are not such as to justify the belief that they are to be attributed to a different race or to a people occupying a higher or widely different culture-status.