1886. ] Boulder Mosaics in Dakota. 3 
that portion is on an inclined surface. This gigantic serpent was 
in good condition when seen in 1883. 
An examination of similar localities over all Southeastern 
Dakota has failed to discover any other similar representations of 
animals. Numerous rude sketches of animals on a smaller scale 
are found near Pipestone, Minn., chipped or pecked on the 
smooth surface of the red quartzite. Some of the best of these 
are exhibited in the Minnesota Geological Report, Vol. 1. In 
these the turtle is a favorite figure, but none are as symmetrically 
represented as in the one on Turtle point. No serpent is repre- 
sented among them. 
Similarly made figures, but quite imperfect, were noticed by 
the writer on Wolf creek, south-west of Bridgewater, Dak. 
But although no more animal figures have been found, a few 
other similarly constructed works have been noted. Upon Indian 
hill, north-west of Valley City, is a rectangular figure between 
two mounds which may be natural. The sides are remarkably 
straight and parallel, and the stones, which are four to twelve 
inches in diameter, are quite regularly laid. The ends are 
rounded a little. Its form is shown in Fig. 7. It is eighteen 
paces long and three paces wide. The direction of its sides is 
N. 78° E. A number of the stones composing it had been lately 
displaced in 1882 when the writer visited it. The holes in which 
they had lain were fresh and showed their form clearly. 
Upon a high broad terrace of Crow creek, a few rods back and 
east from a remarkably fine spring which is at the foot of the ter- 
race, and about a mile north-west of the town of Waterbury, is 
found a somewhat similar figure on a much larger scale; more- 
over it is incomplete and somewhat irregular. Its outline is 
shown in Fig. 8. It eastern side is ninety-two paces in length 
and is directed N. 2° E. The north end is curved slightly, but 
lies nearly at right angles with the left side, which is directed 
N. 15° E. Ata@isan opening which may represent a gateway, - eo 
as an oblique line of stones, sufficient in length to close it, is at 
one end. Near it and at various other places are small circular 
pits, two to four feet across. No pains was taken to locate them 
accurately, as it was thought that they had no oy connection 
with the lines of boulders. i 
The gap at d was probably caused by some recent removal ot 
the boulders for use in forming some tipi-rings not faraway. At 
a 
