36 BUREAU OF AMERICAN ETHNOLOGY [BuLL. 185 
a depth of slightly over an inch. A chalcedony flake and a small 
piece of burned granite were the only associations. 
32M E50 (map 1).—About a hundred yards east of an eagle trap 
listed under this number there was found a stone circle or tipi ring 
18 feet in diameter. No cultural debris was present on the surface, 
and the ring was not tested. 
32M E61 (map 1).—This site is in a wide coulee head, the sides of 
which are gently sloping. It is on the right side of the Missouri 
River, southeast of Red Butte, in the SWYANW%, sec. 32, T. 147 N., 
R. 89 W. A large westward-running coulee splits into three arms 
near the head, and in the upper end of the northernmost of these the 
site is located. The 20 circles present measure very uniformly 18 to 
20 feet in diameter. The arrangement of other stones suggests that 
more rings were once present but have been disarranged by hay- 
making activities. The stones which formed many other circles are 
reported to have been removed some years ago and used in the con- 
struction of a small dam which is present in the main coulee. 
Extending in a row along the crest of a low but steep-sided ridge 
to the south of the stone circles are a dozen small piles of boulders, 
three to six stones in a pile and with the piles 40 to 50 feet apart. 
We were told that these were part of a former’bison trap. It was 
said that only one wing was needed, since the herds, which were 
driven in from the upland to the southwest, would be turned down the 
coulee by people stationed at this simple barricade on the ridge. That 
this was actually the purpose of the small stone piles seems doubtful, 
for while the coulee becomes narrower below this point, there is no 
cut-bank or cliff over which the driven animals would fall. <A ledge 
of rock crosses the coulee bottom some distance below this location, 
forming a drop of not over 4 feet. It is perhaps possible that if a 
herd stampeded down the narrow coulee and over this low drop, 
many young or weak animals would have been so injured in the press 
at this bottleneck and low fall as to render them easily killed by 
unmounted hunters. 
32M E65, North Renner site (map 1).—This site, which is just east 
of the reservation boundary, is well back from the Missouri River, 
on the left side of a gently sloping coulee that carries a small inter- 
mittent stream. The site is immediately below the edge of the up- 
land, in the NW14NE¥, sec. 14, T. 146 N., R. 88 W. The side of 
the coulee slopes gently to the east but at one place is crossed by a 
very low but long and narrow ridge, which extends east-west down 
the slope. Scattered along this slight rise are several boulder rings 
ranging from 17 to 22 feet in diameter. The area where they occur 
is used for grazing and has never been plowed, but the outlines of 
the rings are somewhat irregular, the stones of which they are formed 
