736 KANSAS CITY REVIEW OF SCIENCE. 



A half mile west the granite is traversed by a narrow dyke of black dolerite 

 eleven inches wide at the north end and four inches at the southern end. From 

 the north end it bears South 32° West, for thirty feet, thence it gradually curves-, 

 to South 82° West, a distance of five feet. The adjacent granite wall has been 

 slightly darkened and indurated by contact. 



At the Lloyd place, in Sec. 15, T. 33, R, 5 E., a shaft in decomposed 

 syenite has revealed a vertical dyke eighteen inches wide bearing northeast and 

 southwest. Two hundred feet northwest another shaft reveals a north and south 

 dyke of similar rock two feet wide. The dyke is of a gra^dioritic character. A 

 quarter of a mile east there is a greenstone dyke eight feet wide bearing a little- 

 west of north. At King's, a mile northeast, there is a small vein of specular iron 

 bearing northeast in decomposed granitic sand. A similar vein cuts a red syenite 

 in Sec. 29, T. 34, R. 6 E., and bears N. 15° W. Near King's and at Lloyd's, 

 washings in the roads reveal a good deal of black, shiny particles of magnetic 

 iron sand. The sands of Lloyd's shaft will wash out a good deal of this sand. 

 Similar sand has been found at many places in the northern portion of Madison, 

 Iron and Reynolds, and also in St. Francois County. 



In the southern part of St. Francois County, west of St. Francois River, a 

 pit has been sunk on a rich deposit of micaceous iron, which being very soft was 

 at first supposed to be graphite. The granite is also sometimes traversed by 

 quartz veins as in Sec. 2, T. 33, R. 5 E., and in Sec. 6, T. 33, R. 6 E., also on 

 Cedar Creek, where quartz crystals measuring over six inches in diameter have 

 been obtained. 



At the Einstein silver mines in Madison County, the rocks indicate an asso- 

 ciation of diorite and serpentine. The exact position and relation of the beds 

 could not be ascertained, as all work had been suspended, but the specimens left 

 on the ground were of serpentine, green and violet-colored fluor, white quartz, 

 argentiferous galena, wolfram, iron pyrites and zinc blend. The massive rocks 

 at the river are red and gray granite, with red porphyry just west. 



Only recently has much attention been directed to the quarrying of granite. 

 This industry is yet in its infancy, but, at present, is indicative of increasing ac- 

 tivity. A demand is growing in St. Louis for good material for street-paving, and 

 as the city grows so will this demand. Granite is now being placed upon several 

 streets, and new quarries are being opened in the granite district. Washington 

 avenue and Broadway, at end of the St. Louis bridge, has been paved for six 

 years or more with granite blocks, and the paving is good yet. Polished columns 

 of the Singer building, McLane's building and several others are of Missouri 

 granite. The counter, columns and panels of bar-room of the Southern Hotel, 

 St. Louis, are of Knob Lick granite and are very handsome. Missouri granite 

 has also been used in the Custom House and St. Louis bridge. 



Feldspar from the St. Genevieve granite quarries has been used for several 

 years in the glazing of certain iron-ware. At the Insane Asylum, St. Louis, the 

 borings, after passing through 3,400 feet of Palaeozoic rocks, penetrated red granite. 

 Extensive arrangements for quarrying have been made at the quarries near 



