G. C. Broadhead — Cambrian and the Ozark Series. 59 



Missouri. On the Missouri River I have observed at several 

 places lenticular beds of sandstones intercalated in the Second 

 Magnesian and these sandstones sometimes may be traced for 

 several miles, or as much as 15 miles. 



In the well bored at the Insane Asylum, St. Louis, we find 

 the following series : 



Total depth. 

 40 feet. 

 120 " 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 



Loess to 



Coal .measures to 



Lower Carboniferous 



Lower Silurian 



First Magnesian limestone 



First sandstone 



Second Magnesian limestone 



Second sandstone 



Magnesian limestone, verycherty.. 

 Magnesian limestone and sandstone . 



Sandstone 



Limestone 



Sandstone 



Magnesian limestone 



Sandstone 



Sandstone and limestone _ 



Sandstone, there may be granite at base, 



883 

 1304 

 1452 

 1585 

 2102 

 2184 

 2C71 

 2843 

 2880 

 3022 

 3120 

 3504 

 3545 

 3555 

 3843 



This section indicates other sandstones besides the 1st, 2d 



and 3d. They may be local beds. 

 Madison Countv is as follows : 



My general section in 



Chert beds _ _ 125 feet. 



Magnesian limestone with chert and quartz.. 100 



Magnesian limestone . — 125 



Gritstone and Lingula beds ._ 50 



Marble beds 5 to 25 



Sandstone and conglomerate . _ - 5 to 90 



Xear the Iron Mountain, Conglomerate rests on the Por- 

 phyry ; eastwardly on St. Francois River in Madison County 

 the lower beds of the sandstone are pebbly and rest upon 

 granite. Near Fredericktown the series appears thus: 



1. Magnesian limestone. 



2. Gritstone. 



3. Sandstone. 



4. Red Slaty sandstone. 



5. Granite. 



Ten miles west, lso. 4, of this section is over 20 feet thick, 

 with layers of sandstone and conglomerate above. 



In the northern part of Madison County the marble beds 

 are wanting, but the gritstone beds are present. In the southern 



