70 KANSAS CITY REVIEW OF SCIENCE: 



MINES OF CARTERVILLE, JASPER CO., MISSOURI. 



PROF. G. C. BROADHEAD. 



The general surface is rolling with hills rising about eighty feet above the 

 creeks. The creeks have narrow valleys rising by gentle ascent to the adjacent 

 hills; which are sometimes modified by terraces. 



The mining is confined to the valleys not far from the railroad, and are more 

 productive from loo to 125 feet below the surface. The ores are chiefly zinc. 



From careful examinations we find as follows : The highest rocks seen near 

 by are of a porous or bony looking chert. This occurs in broken and chiefly 

 angular masses on the hill-tops. On the tops of the hills I also observed water-worn 

 chert in considerable quantity and apparently of same age as the massive chert. 

 Outcrops on the hill-sides and revelations in the shafts prove the existence of a 

 limestone about five feet below the hilltops. Fossils were obtained both from 

 the chert and limestone, but only a few species. Among them I recognized 

 Spirifer Keokuk, Sp. lateralis, Hemipronites crenistria, A. Rh) nchonella, A. Phillipsia, 

 Bujozoa and Crinoid stems. Sufficient to be identified with the Keokuk group 

 of the Lower Carboniferous. 



Shallow shafts in draws and valleys show quite an extensive deposit of a blue 

 clay shale. The shale is thickly laminated, and may be of the same geological 

 age as the limestones, but I could obtain no fossils from it. The fact of its being 

 reached in the valleys, also in some shafts on the hillside (where it is found above 

 the limestone) also occupying pockets or "bars" as the miner would say, would 

 indicate that it was newer than the hmestone. It really may have been deposited 

 from a flow through cavities in the other older rocks, in caverns. Another fact, 

 although found in the mines it is not ore-bearing, but generally contains a good 

 deal of iron pyrites. 



A general section of the rocks here, both concealed and exposed, is about 

 this,— 



1. Fifty feet of porous or bony chert with probably some concealed lime- 

 stone. 



2. Outcrop of limestone, generally bituminous with some blue clay in pockets. 



3. Thirty feet of blue clay shale in valleys. It may be of more recent age 

 than I and 2. 



4. Fifty feet of gray crumbling bituminous limestone. 



5. Twenty to thirty feet of chert in irregular broken layers, some altered to 

 quartzite, with pockets and bands of blue clay. This is only reached by deep 

 mining. 



Bitumen is more abundant in the limestone beds, where it occurs sometimes 

 as stains and in drops, and is also found in the form of solid asphalt. 



Galena occurs in the Upper limestone but not abundantly, generally in the 



