100 



MOUND EXPLOEATIONS. 



100 feet, ami of the overlapping portion at the entrance, 45 feet. The 

 wall is quite uniform in size, about 4 feet high and from 25 to 27 in 

 width, and the ditch about 8 or 10 feet wide and from 1 to 3 feet deep. 

 The entrance is 16 feet wide, but there seems to have been no ditch 

 along this portion. On the north, adjoining the wall on the outside 



Fig. 48. — Circular inclosnre near New Albin, Allamakee county, Iowa. 



and extending along it for about 100 feet, is an excavation, Fig. 48 

 (see plan and section), 35 feet wide at the widest point and 3 deep. 



As this ground, including the circle, has been under cultivation for 

 fifteen years, it would be supposed that the height of the wall is con- 

 siderably less than originally, but this is doubtful. On the contrary, it 

 is probable it was originally about 20 feet wide and not more than 3 



