Slump along Highway 16 about 1 mile south of center of Chamberlain. The
lower part of the slump, with a pressure ridge caused by forward and upward
thrusting of the slump block at the toe, is inferred to be the original slump
block. The upper part formed a graben formed by collapse after the original
slump block moved and left the upslope material unsupported. Brule County,
South Dakota. October 14, 1954.
Figure 6 in U.S. Geological Survey. Professional paper 675. 1973.
Professional Paper-0675
Digital File:ecf00003
ID. Erskine, C.F. 3