IGNEOGS INTROSIONS TN THE BLACK HILLS 31 
forced to a higher level than the present crown of the Little Sun 
Dance dome, and has been well exposed by the removal of sur- 
rounding strata. As these hills stand near together on the same 
plain, it is evident that they have been exposed to the same 
erosive agencies. The larger hill is higher for the reason that 
the plug forming its center was forced to a higher level in the 
stratified beds and is also of greater diameter than the similar 
plug which presumably caused the upheaval of the smaller hill. 
It is also to be noted that the sedimentary beds surrounding the 
larger intrusion show less disturbance than those around the 
smaller uplift, which has been dissected less deeply in reference 
to the top of the column of igneous rock. This indicates that 
the greatest amount of disturbance among the stratified beds 
occurred near the summits of the intruded columns. 
Mato Teepee—This remarkable tower has been described — 
very fully by Newton," and to his account of it we are indebted 
for the measurements here used. It stands on the west bank of 
the Belle Fourche River, about twenty-two miles northwest of 
the Sun Dance hills, and six miles southeast of the Little Mis- 
souri buttes, next to be described. 
As stated by Newton, the name “Bear Lodge” is used on 
the earliest maps of the region, although more recently it is said 
to be known among Indians as ‘‘the bad god tower,” or in better 
English, “the Devil’s tower.” Mato Teepee, meaning Bear 
lodge, seems to have been the original Indian name and will be 
used in this paper. 
Something of the impressive grandeur of this lonely column 
may be gathered from the accompanying pictures. Fig. A, Plate 
III., is reproduced from a photograph taken on the banks of the 
Belle Fourche about two miles in a direct line south of the 
tower. Even at this distance the clustering columns that com- 
bine to form the structure may be easily distinguished. Another 
view, showing the columnar structure still more clearly is also 
given on Plate III., which is from a photograph taken about a 
quarter of a mile southwest of the tower. 
*Geology of the Black Hills, pp. 200-202, and frontispiece. 
