414: Tarr — Origin of the Chert inthe Biirlincjton Limestone. 

 Analyses of Jlissonri and Other Similar Cherts 



1 



o 



3 



4 



5 



6 



7 



98-23 



98-17 



98-92 



98-71 



99-46 



99-23 



98-60 



2-18 



•85 



•48 



•43 



-29 



•22 



•52 



Silica (SiOJ 

 Alumina (Al.O^) 

 Iron oxides (Fe^Og) 

 Calcium carbonate 



(CaCOg) 

 Magnesium carbonate 



(MgC03) 

 Magnesia (MgO) -01 -02 ^02 Trace Trace Trace 



Lime (CaO) -05 -03 -03 '04 ^02 -10 



Alkalies 

 (Ignition) ^78 ^42 •SO ^34 -50 ^40 



100-41 99-84 99-87 99-69 100-13 99-97 99-62 



8 9 10 11 12 13 U 15 



Silica (SiOJ 99-13 95-81 91-54 96'88 71-29 94 91 63-67 98-23 



Alumina (AIO3) 1-27 4-52 .,.^g ^.^3 ^.gs 2-20 ^29 



Iron oxides (Fe.^Og) 2^20 -84 



Calcium car- 

 bonate (CaCOg) 1-43 r70 Ml 26-24 ^75 32-12 100 



Magnesium car- 

 bonate (MgCOg) Trace '11 Trace Trace Trace ^57 



Lime (CaO) Trace 



Magnesia (MgO) -01 



Alkalies -15 



(Ignition) -20 -28 1*64 -12 



99-50 100-19 100-41 100*47 99-96 98-51 99-56 99-64 



1. Fresh chert, Mississippian, Henderson Mine, Barr}^ County, Mo. 



2. Fresh chert, East Hollow, Belleville, Jasper County, Mo. "^(591). 



3. Partly altered, same locality. 



4. Altered to " cotton rock," same locality. 



5. Fresh chert. Surprise Mine, Joplin, Mo. (591). 



6. Blue chert, fresh, Bonanza shaft, Galena, Kan. (591). 



7. Same locality, fresh (591). 



8. Altered chert, same locality (591). 



9. Fresh chert, Jonesbc'ro, Montgomery County, Mo., Mo. Geol. Surv. 



10. Altered chert, same locality. 



11. Fresh chert, Lebanon, Laclede Count}^ Mo., Mo. Geol. Surv. 



12. Fresh chert with crinoid stems of calcite, Sulphur Springs, Ark. 



13. Slightly altered Miss, chert, Roaring Springs, Xewton County, Mo. 



14. Fossiliferous, calcareous chert. Miss., Grand Falls, Newton County, 



Mo. 



15. Fresh chert, Burlington formation, Columbia, Mo. 



Analyses 1, 9-14, E. O. Hovey, Mo. Geol. Sury., vol. vii, pp. 727-739, 

 1894. 



Analyses 2-8, Bull. 591, U. S. G. S., p. 222. 

 Analysis 15, Mrs. W. A. Tarr. 



