WORKS IN ALLAMAKEE COUNTY, IOWA. 99 



IOWA. 



The explorations made in this state on behalf of the Bureau were 

 couflued to the couuties bordering on or adjacent to the Mississippi 

 river, and chiefly in the extreme northeastern section. 



Some of the works of this section evidently belong to the same type 

 as those of Wisconsin, effigy or figure mounds being found in one or 

 two of the extreme northeastern counties of the state, showing that 

 the tribes which reared the singular structures in Wisconsin were not 

 limited geographically by the Mississippi, although they extended 

 beyond it but a short distance and over a comparatively small area. 



As we proceed southward a change in the mode of construction and 

 in other respects becomes apparent, indicating the presence of different 

 tribes; yet there is sufticicnt resemblance in the two classes of works 

 to indicate ethnic relationship, or at least that they belong to the same 

 culture state. 



ALLAMAKEE OOUNTY. 



This northeastern county of the state is bordered on the east by the 

 Mississippi river, and much of it watered by the Little Iowa and its 

 branches, all of which have worn deep channels through the Potsdam 

 sandstone, which, whether remaining as castellated cliffs 300 or 400 

 feet high or rounded off to bold bluffs or terraced slopes, results in giv- 

 ing the charming contour and sheltered valleys of a mountain region. 



I'OTTEKY CIHCI.K AND OTHEU WORKS. 



About 7 miles above New Albin, on the Little Iowa river, is an exten- 

 sive group of earthworks, consisting of inclosures, lines of small mounds, 

 excavations, etc., situated on the farm of Mr. H. P. Lane, and repre- 

 sented in PI. V. The largest work is an inclosure, marked A, and 

 shown on a larger scale in Fig. 48, to which the name " pottery 

 circle" has been applied. It is situated on the margin of a bluff 

 overlooking the Little Iowa river and an intervening bog beyond, prob- 

 ably the former channel of the river. It is almost exactly circular in 

 form with clear indications of straight stretches (not shown in the 

 figure), as though somewhat polygonal, the curve being broken on the 

 eastern side, where it touches the brink of the bluff, is there made to 

 conform to the line of the latter. The ends at the southeast overlap 

 each other for a short distance, leaving at this point an entrance way, 

 the only one to the inclosure. A ditch runs around the inside from 

 the entrance on the south to where the wall strikes the bluff on the 

 north, but is wanting along the bluff side and overlapping portion. 

 The north and south diameter, measuring from center to center of the 

 wall, is 251 feet; from east to west, 235 feet; the entire outer circum- 

 ference, 807 feet; the length of the straight portion along the bluff, 



