52 University Geological Survey of Kansas. 
the Arkansas-Indian Territory uplift on the southwest. 
Starting up stream, then, from a proper point along the Ar- 
kansas river, one can turn continuously to the right, first 
into Grand river, then Spring river, and North Fork, contin- 
uously being in the stream occupying the tract between these 
two great water-sheds. 
But the Boston mountains to a considerable extent are 
separate and distinct from the Ozark dome, and yet not en- 
tirely so. The corresponding trough between these two up- 
lift areas is occupied by White river, a less important trough 
river, because the trough itself and the area which drains into 
it are less extensive. 
Winslow” has given a very good discussion on the general 
physiography of this entire area to which the reader is re- 
ferred. Later Marbut™ has given us a most interesting de- 
scription of the physiography of the entire state of Missouri, 
in which is included a valuable discussion on the physiog- 
raphy of the Ozark dome. Still later, Adams” has given us 
a brief but interesting summary of the physiographic con- 
ditions, not only of the Ozark dome, but of the adjacent terri- 
tory in Indian Territory and Arkansas. 
All are agreed that throughout the entire area under con- 
sideration the present drainage is consequent; that is, has 
been produced recently, principally by the earth movements 
producing the Ozark dome, and modified in part by local 
lithological conditions. Any one can observe from a good 
map of Missouri that all drainage channels radiate from the 
high uplands of this area. The axis of the dome is a curved 
line passing northeastward from the extreme northwest cor- 
ner of Arkansas by way of Aurora, Springfield, and Marsh- 
field, gradually veering more nearly to the east, to the 
vicinity of the St. Francis mountains in Iron county. 
By way of résumé the following conclusions may be made: 
First, the Archean and Silurian areas in the Iron mountain 
district probably were the first to be elevated, the date of 
their elevation being as early as Coal Measure time, and 
23, Winslow, Arthur: Mo. Geol. Surv. Rep. vol. VI, p. 303. Jefferson City, 1894. 
24. Marbut, Prof. G. F.: Mo. Geol. Surv. Rep., vol. X., pp. 13-109. 
25. Adams, Dr. George I.: 22d An. Rep. Director U.S, Geol. Surv., part II, pp. 69-75. 
