NeNf ve 
a? 
Yur 
Figure 3. 
\W mesozoic 
“\. CENOZOIC 
Conlon lioaseis 
Ne eee ee Cee LOC mE 
MINNESOTA | IOWA | MISSOURI IrENNESSEE| MISSISSIPPI 
Figure 3: Generalized section showing age of rocks in the Mississippi Valley from Minnesota to the Gulf of Mexico. 
86 
smoT 3S fo aouarrg fo Kmappap ayy fo suoyonsuda 
