FRANKLIN COUNTY 2 

 FEET I —TTTT-rn^gft 



10 



CARBONDALE GROUP 



77 



5$/y£ 3 WABASH COUNTY 4 

 HERRIN N0.6C0AL 



\7p 







• eo 



I 



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^ 

 ^ 



CORRELATION OF NO. 6, 

 5-A, AND 5 COAL BEDS 





LEGEND 



LIMESTONE 



BLACK SHALE 



SILTSTONE 



UNDERCLAY 



?--— — 



SANDSTONE 



Fig. 6. — Correlation of coal beds with the aid of spores from rotary-drill samples. 



by non-biologic means, even in areas where 

 the structure is well established by core 

 drilling and mining operations. However, 

 these variations in the succession of strata 

 materially increase in importance in less 

 well drilled areas. 



A correlation chart (fig. 6) has been pre- 

 pared on the basis of the identification of 

 Nos. 6, 5-A, and 5 coal beds by spores ob- 

 tained from rotary drill-hole cuttings in 

 Wabash and Franklin counties for a com- 

 parison of the strata in these two counties 

 from a short distance above the top of the 

 Carbondale group to a position a short 



distance below the No. 5 coal bed. There 

 is a considerable difference in the succession 

 and the usefulness of spores for purposes 

 of identification of the coal beds. 



Conclusions 



The coal beds of the Carbondale group 

 can be differentiated from each other and 

 from the coal beds of the older Tradewater 

 and younger McLeansboro groups by means 

 of their spore population. There are 13 

 genera and 56 species of spores present in 

 the coal beds investigated. In addition, 

 there are two new genera and several new 



