PALEOZOIC MESOZOIC CENOZOIC 
252 IOWA ACADEMY OP SCIENCE 
GENERAL GEOLOGIC SECTION OF MISSOURI. 
Eras 
Periods 
SUB-P., 
Series 
Terranes 
Thick 
Rocks 
QUATERNARIC 
Late 
25 
Loess 
Mid 
Pleistocene 
Interval 
Unconformity 
Wisconsin ... 
Peoria 
25 
25 
Gravels 
Loess 
Interval 
Unconformity 
Kansas 
50 
Till 
Early. _ 
Interval 
Unconformity 
TERTIARIC 
Late 
Poinsettan 
Lafayette ... 
50 
Gravels 
Mid 
Interval 
Unconformity 
Early.. 
Crowley an 
Wilcox 
Porter ... .. 
100 
50 
Shales 
Clays 
Interval 
Unconformity 
Late 
Ripleyan—. 
Egypt 
150 
Sands 
Mid 
Dakotan 
Interval .. _ 
Unconformity 
Nishnabotna 
20 
Sandstones 
Early.. 
ComancJian 
Interval . .. 
Unconformity 
JURASSIC 
Interval 
Wanting 
TRIASSIC 
Interval 
Wanting 
CARBONIC 
Late 
U'nrep’sented 
Mid 
Missourian 
Atchison 
Forbes 
Platte 
Plattsmouth 
Lawrence 
Stanton 
Parkville 
lola _. 
Thayer 
Bethany 
300 
35 
125 
50 
250 
30 
100 
40 
100 
75 
Shales 
Limestones 
Shales 
Limestones 
Shales 
Limestones 
Shales 
Limestones 
Shales 
Limestones 
Des Moines 
Marais des C. 
Henrietta 
Cherokee 
30'0 
75 
225 
Shales 
Limestones 
Shales 
Arkansan 
Sonora 
100 
Shales 
Early. - 
Tennessean 
Chester .. .. 
Kaskaskia .. 
Aux Vases 
Genevieve 
St. Louis ... 
100 
125 
150 
150 
200 
Shales 
Limestones 
Sandstones 
Limestones 
Limestones 
Mississippian— 
Interval 
Unconformity 
Spergen 
Warsaw 
Keokuk 
Burlington __ 
100 
65 
75 
125 
Limestones 
Shales 
Limestones 
Limestones 
Waverlyan 
Interval 
Unconformity 
Chouteau 
Hannibal 
Louisiana ... 
Saverton 
Grassy 
g'O 
75 
50 
50 
40 1 
Limestones 
Shales 
I.imestones 
Shales 
SIirIgs 
