88 



ILLINOIS STATE GEOLOGICAL SURVEY 



southern Saline Counties, southeastern 

 Illinois, lies above the Stonefort Limestone 

 and from 15 to 40 feet below the DeKoven 

 Coal. This coal has been correlated with 

 the thin but persistent Wiley Coal of west- 

 ern Illinois (Wanless, 1939; Kosanke, 1950; 

 Wanless, 1955) . The Wiley Coal lies above 

 the Seahorne Limestone and below the 

 Greenbush Coal. 



The following genera and species were 

 identified from the Davis Coal (maceration 

 518A-B), Saline County: 



Triletes triangulatus (A, - ) 



T. rugosus (P,R) 



Monoletes (P,R) 



Cystosporites giganteus (?, - ) 



Parasporites (R, - ) 



Spencerisporites cf. S. gracilis ( -, R) 



Two other samples from Franklin Coun- 

 ty, possibly of the Davis Coal, also were 

 examined; one (maceration 535) contained 

 no identifiable spores, and the other (mac- 

 eration 554E) contained only a few frag- 

 ments of cuticle, resin rodlets, and spores 

 of Monoletes. 



The Wiley Coal (maceration 525A-B) , 

 1 1 inches thick, Fulton County, has an as- 

 semblage remarkably similar, with respect 

 to the variety and relative abundance of 

 spores, to that of the Davis Coal. However, 

 in the Wiley Coal the spores are generally 

 more abundant and, in addition, spores of 

 Triletes mamillarius are common and T. 

 aaritus and Cystosporites varius are pres- 

 ent. The two coals seem to be character- 

 ized by the joint, but rare, occurrence of 

 spores of Parasporites and Spencerisporites 

 cf. S. gracilis. 



DeKoven Coal 



The DeKoven Coal, 30 to 36 inches thick 

 in Saline and Williamson Counties, over- 

 lies the Davis Coal and is the highest 

 named coal in the Tradewater Group of 

 southeastern Illinois. In places it has been 

 cut into or entirely cut out by the Palzo 

 Sandstone, the basal unit of the Carbon- 

 dale Group. The Greenbush Coal of west- 

 ern Illinois has been correlated with the 

 DeKoven Coal by Wanless (1939), a cor- 

 relation corroborated by studies of small 

 spores (Kosanke, 1950) . Wanless (1955) 

 stated that the Greenbush Coal of western 



Illinois is generally absent or represented 

 by only a thin film of carbonaceous 

 material. 



The following genera and species were 

 identified from the DeKoven Coal (macer- 

 ation 519A-B), Williamson County: 



Triletes triangulatus (C,P) 



Monoletes (?,?) 



Spencerisporites cf. S. gracilis (P,C) 

 Parasporites (R>R) 



Cystosporites giganteus ( -, R) 



C. varius ( -, R) 



The DeKoven Coal generally is distin- 

 guishable from the underlying Davis Coal 

 by the lack of Triletes rugosus. T. triangu- 

 latus and Monoletes seem to be dominant 

 elements in both coals. 



A sample of the DeKoven (?) Coal (mac- 

 eration 554D) from a Franklin County core 

 yielded only rare spores of Monoletes, Cala- 

 rnospora, and Triletes rugosus. The latter 

 species is unknown from the DeKoven Coal 

 (maceration 519A-B) from Williamson 

 County. 



A coal was found about 9 feet above the 

 DeKoven Coal, Ei/ 2 NE14 NE14 sec. 20, T. 

 10 S., R. 5 E., Saline County. Two hundred 

 feet to the west the coal was absent. The 

 following genera and species have been 

 identified from this unnamed coal (mac- 

 eration 936) : 



Triletes rugosus (P) 



T. auritus (P) 



Monoletes (?) 



Cystosporites varius (R) 



T. ramosus ? (R) 



T. triangulatus, Parasporites, and Spenceri- 

 sporites cf. S. gracilis, found in the under- 

 lying DeKoven Coal, are not represented. 

 T. rugosus and T. auritus are not known 

 from the DeKoven Coal. 



A sample of an unnamed coal 12 inches 

 thick (maceration 35) occurring above the 

 DeKoven Coal in the NW14 sec. 21, T. 10 

 S., R. 5 E., Saline County, Illinois, contains 

 an assemblage similar to that of the De- 

 Koven Coal (with one exception) in re- 

 spect to kinds of spores and to relative 

 abundance of the different types. In gen- 

 eral, large spores seem to be more abundant 

 in this unnamed coal, which, in contrast to 

 the DeKoven Coal, contains some spores of 

 Triletes mamillarius, Calamospora cf. C. 

 laevigata, and one questionably referred to 



