An Old Platte Channel. — Condra. 
365 
Stratigraphy. 
General. — Since most slopes are covered In- loess the num- 
ber of rock-bed exposures is small. In the region of Ashland, 
Coal Measures strata and the Dakota sandstone come to the 
surface at a number of places along the Platte and Salt creek. 
Both of these formations dip slightly to the northwest where 
the latter is overlaid by the Benton which is exposed near 
Morse Bluff and reached in a boring north of Cedar Bluffs. 
J. G. Martin, while sinking a test well at the foot of the bluffs 
near the southern end of the C. & N. W. bridge struck a shaly 
coal (Benton) at a depth of 100 feet. 
ASANOONCD VALLCV 
FIVE MILES 
URItO CMrtNNEL 
trTH (» 
.i*op, ^ 
t; PLATTE yiLLEV ijqO. 
. I2M 
PLATT£ FLOOD PLAIN. . 
^..pt.eT.m?) V:l 
CROSS SECTION NEAR FREMONT AND CEDAR BLUFFS. 
FIVE MILES , WOO. 
PLATTE VALLEV, . [^ JJOO 
T^^-psa -^;..ft^>T Hiiy^:-\ 
CROSS SECTION BETWEEN WAMOO AND COLON. 
FIVE MILES. . 
SECTION ACROSS VH^ PLATTE DELOW ASHLftNO. 
Fig. 2. 
The drift is a variable quantity : it may lie on either of the 
formations named, varying with the locality. Stratified clays 
and sand predominate in the region of Fremont, while bowl- 
ders increase in number and the amount of clay and sand de- 
creases to the south and southwest. 
Except for the flood plain of the Platte and a few places on 
the steepest hills, the loess forms a thin veneer over the country, 
concealing other deposits and thereby making it all the. more 
necessary to use well records as evidence. 
Platte Flood Plain. — Here the soil forms a thin .surface 
layer beneath which is sand varying in thickness from about 
sixty feet, below Ashland, to 200 or 300 ( ?) feet at Fremont. 
Thin seams of clay and quicksand are at times encountered. 
Note. — "Abandoned Valley" should read Todd Valley. 
