362 The American Geologist. J"'^^- i^^-^- 
Data on which the paper is based have been collected from 
a number of somxes extending over a period of ten years. In 
1893. while passing from York to Fremont over the Chicago 
and Northwestern (Formerly F. E. & M. V.) railroad, the 
break or gap in the bluffs between Morse Blufif and Cedar 
Bluff's was observed and noted. Later, and at diflerent times 
while traveling between I^incoln and Fremont over another 
line of the same railroad, as well as to and from Valley over the 
Union Pacific railroad, my attention has been directed to the 
valley with its bordering highlands which show a quick change 
in topography. The C. & N. W. railroad passes obliquely 
across the valley between Wahoo and Cedar Bluffs a distance 
of twelve miles, while the U. P. railroad traverses the valley 
between Wahoo and Mead a distance of about six miles. On 
the Fremont topographic sheet Mead is incorrectly given as 
jNIarietta. Marietta is a precinct northwest of Mead. 
The v/riter has made trips with a team and on foot to prac- 
ticall}- all points shown on the accompanying map. Superin- 
tendent J. W. Searson of Wahoo has assisted me in making 
the acquaintance of well men in different towns. The most 
valuable well records were obtained from I. S. Crawford of 
Wahoo, E. G. Adell of Yutan, and J. G. Martin of Cedar 
Bluffs. 
C. A. Fisher, in 1898, mentioned and briefly described the 
valley in his second degree thesis, "Geology of Saunders Coun- 
ty." The relief map published by N. H. Darton, 1898, plainly 
shows the region (See 19th Ann. Rep. U. S. G. S., Pt. IV, 
PL 75). Wahoo, and Fremont topographic sheets from 
which the accompanying map was drawn, show the surface 
conaitions in detail. Professor J. E. Todd, in Bull. 158 U. S. 
G. S., 1899, gives valuable data on stratigraphy and topography 
as well as the probable oiigin of 'the valley which we are at 
present considering. 
Topography. 
General. — The map, or Fig. i, shows two lowland areas 
and the highlands. Two distinct types of topography, differ- 
ing in origin, are represented. The flood plain or valley floor 
of the Platte, and the floor of Todd valley constitute the low- 
lands ; the latter, however, is somewhat elevated at the north- 
