58 University Geological Survey of Kansas. 
lying in the valleys between the more ancient hills or mounds 
of the crystallines, are Cambrian or Lower Silurian in age. 
To the west one passes onto rocks of younger age. Shep- 
ard” gives the following tabulated scheme for rocks included 
within Green county, Missouri, which practically includes 
all rocks herein mentioned : 
TABLE OF GEOLOGICAL FORMATIONS IN GREEN COUNTY, MISSOURI. 
SYSTEM. Series. Stage. Formations. 
Des Moines. Cherokee. Graydon sandstone. 
Upper Burlington limestone. 
Carboniferous. Augusta. 
Lower Burling‘ton limestone. 
Mississippian. 
7 Chouteau limestone. 
Kinderhook. Hannibal shales.,; 
Louisiana limestone. 
Phelps sandstone. 
Devonian. Hamilton, Sac limestone. 
King limestone. 
Black shale. 
First magnesian limestone. 
Cpe First sandstone. 
Silurian. Ozark. Second magnesian limestone. 
Second sandstone. 
Third magnesian limestone. 
Adams* gives a general discussion of all the Missouri- 
Arkansas rocks, and summarizes the matter by the scheme of 
classification printed at top of page 59. 
He accompanies this discussion with two geological sec- 
tions, one north and south, the other east and west, which are 
included here as figs. 1 and 2, p. 60. It is probable the for- 
mations exposed at the surface through the Ozark area pass 
westward and dip under the Coal Measure shales, sandstones 
and limestones of sotitheast Kansas and northeast Indian 
territory. The Galena area is the farthest west of any lead 
or zinc mining area yet operated, and consequently the closest 
to the Coal Measure area. How great a period of erosion 
intervened between Mississippian time and Coal Measure 
time is quite problematic, but we know that the Mississip- 
pian rocks for fifty miles or more west of their present sur- 
face exposure were eroded to a considerable extent before the 
Coal Measure formations were placed upon them. It is proba- 
27. Shepard, Prof. Edward M.: Mo. Geol. Surv. Rep., vol. XII, p. 49. 
28. Adams, Dr. George I.: U.S. Geol. Surv., 22d Ann. Rep., pt. II, pp. 76-94. Washington, 1901. 
