4 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 445 



Depth 



(ft) 







200- 



400- 



600 



800 



1000 



I200- 1 



I 1 I I 



TTTT 



Shoal Creek Ls 



No. 7 Coal - _ _ 

 No. 6 Coal- ______ 



No. 5 Coal ---___ 

 No. 4 Coal 



Lowel I Coal 



No. 2 Coal---- _______ 



IT) 



Ld 

 Q_ 



MISSISSIPPIAN 



UPPER 

 DEVONIAN 



MIDDLE 



Chouteau Ls. Fm. /' 

 New Albany Group 

 Wapsipinicon Ls. Fm. 



Text fig. 2 - Stratigraphic sections of boreholes in which Devonian coal was 

 found (sample numbers refer to table 1 and text figure 1). 



dense, fine grained, and contains up to almost 50 percent fine quartz sand. The 

 sand grains are rounded and well sorted as they are in many of the lower Paleozoic 

 sandstones of the Illinois Basin. 



A few small pieces of coal were taken from this sample, embedded in an 

 epoxy pellet, and polished for microscopic examination. 



The microlamination of the purer coal bands is mainly displayed by the ori- 

 entation of vitrinite lenses (pi. 1, fig. 2). These generally range from 10 to 500 [i 

 in length and comprise 23 volume percent of the coaly material. Two-thirds of 



