THE DRIFTLESS REGION OF WISCONSIN 829 
It is considerably broader and higher at the east 
the old valley. i 
end. At the west end it has been considerably encroached upon 
At this end where it abuts against the 
by the torrent course. 
Figure 7 
CE WAVY, 
= Y ! =a be 
SS Bz =) - 
= = AWW |/7-— 
: cas ZZ \ y, Wy cea 
BAS My 
eS i 
PASS 
a = 
AW == = 
“\ SS 
fe = 
= = 
ey => \l WZ 
2 c K A= = 
ae SS 
SAIN My gMis8 IX), sone Wir a eS 
SQ Jarnann 2 =, 
= AZ. —ZA\\\ 
Tee Sy ea Se Fe 
= ES Ze 
i . Out- 
Fic. 1.— Sketch of map of vicinity of Trempealeau, Wis., described in text 
wg, Rock gorge of west valley; eg, Rock gorge of east 
lines of valleys in broken lines 
valley; a, Point composed of large rock masses ; 4, Transvesre ridge ; ¢, Filling of east 
valley; d, Outlying low knob; ss, Sandstone plateaus ; w-, yz, Lines of sections 
side of the valley, it meets a projecting spur from the hills, and 
et Suk 
through this spur the upper end of the rock gorge passes 
face indications show that material similar to the ridge extends 
down the east side of the valley as far at least as the low knoba, 
Fig.1, but its center along the line of section is occupied by nearly 
On the west side gullies show that a bowlder bed 
pure sand. 
