ee 
86 University Geological Survey of Kansas. 
were found that were free from fractures, perhaps the most 
so of any place in the district. 
Another place where bedded structure is moderately pro- 
nounced is near the north line of the Geissinger ground, the 
northwest quarter of section 26, south of Galena. During 
the summer of 1899 at a depth of 110 feet a bed of blanket 
lead ore was found here which proved very productive for a 
number of months. The ore averaged from six to twelve 
inches in thickness, over which a mass of flint rock formed a 
roof that seemed to be perfectly bedded. The mine was opened 
by a drift trending east and west, which was carried to the 
limits of the lot lines. The drift had an unusually smooth 
and even roof, the bottom of a broad layer of flint rock about 
four feet above the ore, with the intervening space filled with 
less evenly bedded flint, but still showing bedded structure 
quite plainly. 
The most prominent structural features produced since the 
rocks were formed are. the fissures, fractures and faults so 
noticeable about the area. Faults probably have been pro- 
duced to quite a limited extent. Van Hise, Bain and Adams* 
have expressed an opinion that faulting is much more exten- 
sive throughout the Joplin district than most geologists had 
expected. This may be correct, and yet one familiar with 
the country cannot help but wonder if they did not carry this 
idea a little too far. Lithologic conditions are such that faults 
would be difficult to recognize in some localities, and likewise 
it would be difficult to establish their absence. The com- 
paratively rapid change from limestone to flint, or vice versa, 
may be mistaken for faulting, and likewise a fault might ex- 
ist at such a place without positive recognition. A good ex- 
ample of such conditions is found in the valley near where 
Cooper hollow enters Short creek. The land belonging to 
the South Side Mining Company is entirely occupied with 
. flint, excepting a small area in the northeast corner. Here 
on a hillside limestone is found, and yet a study of conditions 
in different shafts shows that the limestone and flint blend 
together by overlapping tongues, as previously explained, so 
*U. S. Geol. Surv., 22d An. Rep., pt. II, p. 38, et seq. 
