4 Boulder Mosaics in Dakota. (January, 
6 is a circular pit with boulders on its sides and a pile of pebbles 
in its bottom. Atc is a triangular pile of stones about three feet 
on each side. The southern ends of the sides are not far from 
the side of a ravine. A more careful examination would prob- 
ably discover other interesting and perhaps more significant 
relations. 
According to Mr.T. H. Null, of Waterbury, who has seen it, there 
is, on the S. W. 1%, S. 28, 109.66, a cross formed of two lines of 
boulders. One four rods long is crossed at right angles by an- 
other one and a half rods long. At the end of the first, which 
would correspond to the foot of the cross, is a pile of ones 
Though this completes the list of “boulder mosaics,” it may 
not be out of place to speak of a somewhat related work noted 
by the writer, in 1881, in Brown county a few miles north-west of 
Westport. On the right bank of Elm river were two quite con- 
spicuous mounds, 270 paces apart, upon two symmetrical knolls. 
Beginning at the top of the north-western one, a line of bones 
extended over the center of the other, and 146 paces beyond, - 
where it ended in a small pile of boulders. The bones were 
mostly the leg bones of buffalo set up in the ground like stakes. 
That was before the land was in market. Ere this the plow of 
the white man has probably removed all trace of them. A few 
years more and the more enduring “ boulder mosaics ” will prob- 
ably help to form the stone wall of some enterprising settler, as 
careless of the sacred associations: attending them as the Turk 
who builds the fragments of ancient temples into his hovel. 
EXPLANATION OF PLATE I. 
t 
Fic. 1.—A sketch of Turtle point from the north-west. 
«“ 2 —P]an of mound with figures upon the summit of Turtle point, near Wessing- 
ton Springs, Dak. 
3—Enlarged view of the turtle in Fig. 2 
4.—Ground plan of the great dapin 3 on the suminit of Medicine “hill, near 
Blunt, Dak. _ o 
“ ¢Enlarged view of the head of the same. 
“ 6,—View of Medicine hill from the east. 
7.—Plan of a figure on the summit of Indian hill, near Valley City, Dak, 
“ § Plan of a figure near Waterbury, Dak. 
Norx.—The figures are all drawn in their correct position with reference to the 
points of the compass, 
£ 8 
R 
