166 KEMP'S ORE DEPOSITS. 



ore bodies have never been well described and no very accurate 

 diagnosis can be given. They are found in Livingston, Crittenden, 

 and Caldwell counties, Kentucky, in that portion of the State 

 lying south of the Ohio River and east of the Cumberland. "While 

 limestone always forms one wall, a sandstone of geological rela- 

 tions not well determined forms the other. The veins run from 

 two to seven feet wide and in instances are richer in their upper 

 portions than in the lower. As yet they are of greater scientific 

 than practical importance. Some galena occurs also in irregular 

 cracks in the limestone. As a possible indication of a stimulating 

 cause for the formation of the veins, the interesting dike of mica- 

 peridotite may be cited, which has been described by J. S. Diller. 1 

 The dike occurs in the same fissure with a vein of fluorspar. 2 



2.06.06. Example 25. Southwest Missouri. Zincblende and 

 very subordinate galena with their oxidized products, associated 

 with chert, residual clay, calcite, a little pyrite and bitumen, in 

 cavities of irregular shape and in shattered portions of Subcarbon- 

 iferous limestone. Across Missouri, from a point south of St. 

 Louis, and including the country as far to the northwest as 

 Sedalia and Glasgow, a broad belt, called the Ozark uplift, extends 

 southwesterly into Arkansas. It has formed a great plateau in 

 central and southern Missouri and consists largely of Silurian 

 rocks. These have a fringe of Devonian on the edges and dip un- 

 der the Lower Carboniferous. The plateau reaches 1500 feet above 

 the sea in Wright County, but on the limit is succeeded by lower 

 country. To the southwest it drops somewhat, with Lower Car- 

 boniferous strata outcropping, which in Kansas are overlain by the 

 coal measures. The surface then rises again in the prairies. At 

 the edge of the plateau is a trough, in whose bottom the Lower 

 Carboniferous strata are cut by the Spring River, which flows 

 southwesterly from Missouri across the western State line into 

 Kansas and has a general direction parallel to the western limits 

 of the uplift. It receives tributary streams on each bank, which 

 cut the strata in strongly marked valleys and afford good ex- 

 posures. Those on the east bank, from south to north, are Shoal 



1 " Mica-Peridot ite from Kentucky," Amer. Jour. Sti., October, 1892. 



2 S. F. Emmons, "Fluorspar Deposits of Southern Illinois," M. E., 

 February, 1892. C. J. Norwood, " Report on the Lead Region of Living- 

 ston, Crittenden, and Caldwell Counties," Kentucky Geol. Survey, 1875, 

 New Series, Vol. I., p. 449. 



