PLATE XXXVIII. No. 4. ANCIENT WORKS, PRAIRIE JEFFERSON, LOUISIANA.

This group of ancient works occurs on Prairie Jefferson, Moorhouse parish, Louisiana. They are minutely described by Prof. C. G. FORSHEY, in a letter to Prof. Silliman of New Haven, published, with the accompanying plan, in the American Journal of Science and Arts, vol. xlix. p. 38. For some interesting facts in addition to this account, acknowledgment is due to Dr. HARRISON, proprietor of the plantation upon which these remains are situated.

The works, consisting of a series of mounds and terraces, accompanied by lines of embankment and by excavations, are found near the south-western portion of the prairie, and partly in what is now woodland, though probably at no very remote date free from forests. The mounds are disposed with some degree of regularity in respect to each other, and are of the following dimensions:

length,
feet
width,
feet
height,
feet
A. base,18013548
A. summit,5145
B. summit,210755
C. base,1321324
D. summit,1201204
E. summit,604210
on
summit,
length,
feet front
length,
feet rear
length,
feet wide
length,
feet high
F.60784212
G.60395112
H.6060547
I.36274510

The embankment between E and F is one hundred and thirty-five feet long, fifteen feet broad at the base, and four high. The embankment j k l is ten hundred and fifty feet long, twelve feet broad and from one to three feet high.

The great mound E has been denominated “the Temple.” It has a level area on its summit fifty-one feet long and forty-five broad, which is reached from the west by the winding graded path X. All its angles are much rounded; still its four faces are very plainly marked. Since it has been cleared of trees, several p114 slides have marred its symmetry. These slides, as also excavations made in it, have shown that it consists of a series of strata or tables, one above the other, each surmounted by a burned surface, resembling rude bricks. No bones have been found in it. Any extended examination of its contents is avoided, from a desire to preserve its proportions. From the summit a good view may be had of the surrounding works and country.

The mounds which face the “Temple” on the west have great uniformity of figure and dimensions, and are highest in the rear, except E and I, which are nearly level on top. E, F, H, and I, have terraces in front; and all incline gently to the plain, which exhibits marks of excavation. In the rear and on the sides they are for the most part very abrupt. The pond in the rear is evidently artificial, and formed by removing the earth for building purposes. Extending around this pond are an embankment and ditch, (j k l,) the latter produced by the excavation of the earth for the embankment, which seems to have constituted a sort of levée around the pond to the high grounds at j and l.

“The mounds C, D have great similarity in their magnitude, form, and general position in respect to the “Temple;” but situated, as they are, in cultivated fields, their definite outlines are fast disappearing. B, however, differs essentially from the other mounds of the system; it is perfectly level on its summit, of gentle declivity and moderate height, and has been fitly chosen as the site of a dwelling-house, which fronts the area surrounded by the mounds.

“The several ponds have outlets for the water at particular points, which were probably controlled as the mound-builders desired. The long embankment (m n o) is abruptly cut off at o, but is continued again towards p, diminishing in magnitude as the land grows higher, until it almost disappears at s. The swale or low strip of ground which borders this embankment on the left, continues up to very near the pond at s, but has no actual connection with it. It does not appear that the large pond, within this grand levée, is artificial. The smaller ones, however, were manifestly produced by throwing up the earth around them, as at m n; s; t u, and v w.

“The necessity for these artificial ponds is apparent from the fact, that there are no streams or supplies of water nearer this prairie than five miles. Hence the excavations, usually made without apparent design in constructing the mounds, are at this place so economized as to produce the ponds in the immediate neighborhood. Here the conformation of the ground, which is gently undulating, rendered it easy to construct large ponds or lakes, to contain a perennial supply of water. This has plainly been the object of the extensive levées or embankments traced in the map. The general inclination of the land is southward, and the drains in its surface were with some skill called into aid.”

A similar mode of retaining a supply of water has already been remarked, in the case of a fortified hill, in Ohio. (See page [15].) The ancient inhabitants of Central America resorted to the same method. Their aguadas, lined with pavements and enclosed by embankments, are among the most interesting remains of ancient art. p115

p124

CHAPTER V. MONUMENTS OF THE NORTH-WEST.

It has already been observed that the ancient monuments of the Southern United States, although partaking of the general character of those of the central region, are nevertheless in many respects peculiar. While enclosures are comparatively few, mounds are abundant and of great size and symmetry, and possess a regularity of arrangement which we look for in vain among the corresponding structures of a higher latitude. Proceeding to the North and North-west, we find the earthworks assuming a new form and character, in many respects so unlike those both of the central and southern divisions of the country, that we are almost induced to assign them a different origin. As at the South, there are few enclosures or works of defence; but, instead of regular pyramidal structures, the mounds generally assume the shape of animals, presenting a thousand singular forms and combinations. These effigies are situated upon the undulating prairies and level plains, and are accompanied by conical mounds and occasional lines of embankment; but the latter, except in a very few instances, have no obvious design, and enter into none of the combinations which we notice in the works of the Ohio valley. The interesting field occupied by these remains has not fallen within the range of the investigations of the authors, who are therefore unable to present much that is new respecting them; still, it will be necessary to embody the facts thus far disclosed in a general manner, in order to an adequate comprehension of the scope and character of our antiquities. And here, at the outset, we have again to regret the small amount of information respecting these works in possession of the public, as well as its unsatisfactory nature, resulting from the necessarily limited and disconnected observations of those who have paid any attention to the subject. These observations have been made by men of inquiring minds, in the scanty intervals of professional business, and are consequently too detached to justify or sustain any general conclusions. They have served rather to excite than to gratify curiosity, and in this way they may have the good effect of leading to a full and careful survey of the entire field.

The first public notice of the existence of these singular relics at the North-west, was made by RICHARD C. TAYLOR, Esq., in the “American Journal of Science and Art,” for the month of April, 1838. His paper, which was accompanied by several illustrations, attracted considerable attention, and was followed, in the same Journal for 1843, by a more extended account, very well illustrated, from the hand of S. TAYLOR, Esq. A later notice by Prof. JOHN LOCKE constituted a short chapter in the “Report on the Mineral Lands of the United p125 States,” presented to Congress in 1840 and published in 1844. These, with a few unsatisfactory notices in the public prints, comprise the only sources of information which we possess; and from them the following facts are mainly derived.

The field in which these remains occur, so far as observed by the above authorities, is embraced within the lower counties of Wisconsin, and extends from Prairie du Chien on the Mississippi, by the way of the Wisconsin and Rock rivers, eastward towards Fond du Lac on Lake Winnebago, and Milwaukie on Lake Michigan. The country thus indicated is about one hundred and fifty miles in length by fifty in width. The great Indian trail or “war path,” from Lake Michigan near Milwaukie to the Mississippi above Prairie du Chien, which has for the most part been adopted as the route of the United States military road, passes through this chain of earthworks. They are found in abundance by the sides of this great natural pathway, which has been for ages and must for ever remain the route of communication between the Great Lakes and the Great River. They occur principally in the vicinity of the large water-courses, observing in this respect a marked conformity with the remains of other sections, and are invariably placed above the influence of freshets or inundations. Like those of the Ohio valley, they are seldom found upon hilly or sterile lands, but mainly upon the rich undulating plains, or on the levels corresponding to the alluvions of the Ohio.

They consist of elevations of earth, of diversified outline and various size, for the most part constituting effigies of beasts, birds, reptiles, and of the human form; but often circular, quadrangular, and of oblong shape. The circular or conical tumuli differ from those scattered over the whole country in no outward respect, excepting that they are much smaller in their average dimensions; the largest seldom exceeding fifteen feet in height. Those in the form of parallelograms are sometimes upwards of five hundred feet in length, seldom less than one hundred; but in height they bear no proportion to their otherwise great dimensions, and may probably be better designated as walls, embankments, or terraces, than mounds. These works are seldom isolated, but generally occur in groups or ranges, sometimes, though not always, placed with apparent design in respect to each other. In these groups may be observed every variety of form,—the circular, quadrangular, and animal-shaped structures occurring in such connection with each other as to fully justify the belief that they are of contemporaneous origin. At first glance, these remains are said to resemble the sites or ground-plans and foundation-lines of buildings; and it is not until their entire outline is taken into view, that the impression of an effigy becomes decided. This is not surprising, in view of the fact that they are usually of inconsiderable height, varying from one to four feet; in a few cases, however, rising as high as six feet. Their outlines are, nevertheless, represented to be distinctly defined in all cases where they occupy favorable positions. Their small altitude should cause no doubt of the fidelity of the representations which have been made of these figures; since a regular elevation of six inches can be readily traced upon the level prairies and “bottom-lands” of the West, especially when it is covered with turf. The following illustrations, selected from those presented by the authorities above mentioned, will serve to explain the character of p126 these remains. It is to be regretted that explanatory sections do not accompany the plans, so as to exhibit, at one view, the altitude as well as general outlines and dimensions of the figures.

[♠] XL. Ancient Monuments Seven Miles East of the Blue Mounds, Dade Co. Wisconsin.