The Geologic Historjj of JI i.ssonri. — Winslov. 
83 
Classification of Missouri Rocks. 
Carbon- 
iferous. 
Devonian. 
Silurian. 
Cambrian. 
Algonkian. 
Archean. 
Coal 
Measures. 
Lower 
Carbon- 
iferous. 
Upper 
Silurian. 
Lower 
Silurian. 
Upper. 
Middle, 
Lower. 
Kaskaskia. 
St. Louis. 
Augusta. 
Kinderhook. 
Trenton. 
Ozark. 
Doubtfully present. 
Pilot Knob beds. 
Southwest 
Missouri. 
Southeast 
Missouri. 
Eureka shale. 
Hamilton, 
Onondaga 
limestone. 
Oriskany 
sandstone. 
Lower 
Helderberg. 
-Absent. 
Absent. 
White River 
limestone, in- 
cluding sev- 
eral beds of 
sandstone. 
Niagara. 
Cape Girard- 
eau limestone. 
Hudson River 
shale. 
Receptaculitei 
limestone. 
Trenton lime- 
stone. 
Joachim lime- 
stone. 
Central 
Missouri. 
Potosi 
limestone. 
St. Joseph 
limestone. 
La Motto 
sandstone. 
Iron Mountain 
conglomerate. 
.\bseiit. 
.\bsent. 
Absent. 
Roubidoux or 
— Saccharoidal 
sandstone. 
Jefferson 
City lime- 
stone. 
Moreau 
sandstone. 
CD 
-o 
Osage 
limestone. 
o 
Cole Camp 
sandstone. 
o 
Proctor 
limestone. 
Porphyries and Granites of the St. Francois mountains. 
By Southwest Missouri is meant the western half of the state south of the Missouri. 
By Southeast Missouri is meant the eastern border of the state, south of the Mis- 
souri river, a strip about 50 miles broad. 
By Central Missouri is meant a strip about i;o miles broad, extending south from the 
Missouri river and lying between the southeastern and southwestern districts. 
