THEIR USE IN CORRELATION 123 



PLATE 15 



Fig. 1. — Thin cross-section of the Reynoldsburg coal from Johnson County, Illinois. The section 

 contains numerous bands of anthraxylon, some attritus, opaque matter, and spores. 

 Many of the spores are of the genus Denso-sporites which in cross-section appear dumb- 

 bell shaped. 350X. 



Fig. 2. — A thin horizontal section of the Reynoldsburg coal from Johnson County, Illinois. The 

 section contains many ("splint spores") spores of Denso-sporites reynoldsburgensis. 

 350X. 



