Plate ı 
Mansfield :—Post-Pleistocene Drainage. 103°40 
on 
N 
ne 
ee 
7 
aes 
A 
N 
Pa 
N 
Be A 
SAS 
et 
i 
3 
NN \ 
S 
x 
y 
SS Lal GE Ls 
MZ, KR GR 
4420 
4420 
LEGEND 10340" ELI 
194 Pleisfocene Gravels —— Observed general boundaries Letters ([6etejs localities from which Lines connect possible sources with 
L Rectangles = Possible Sources of Pebbles o Inferred general boundaries pebbles were collected localities from which pebbles 
~-~ Mapped by TA Jaggar Jr A=Algonkian C= Cambrian I-14=Porphyries were taken. 
Drainage and Culture from Spearfish and Sturgis Sheets U.S. G.S. 
o $ 
oa ; 3 oe Y Miles 
