McLEANSBORO GROUP 



85 



worthy that Punctati-sporites is uncommon, 

 which is in direct contrast to its abundance 

 in the very thin Upper Scottville coal bed 

 about 30 feet higher in the section. 



The following genera and species have 

 been observed in the Scottville coal bed 

 (maceration 578) : 



1. Punctati-sporites sp. 



2. Granulati-sporites granulatus Ibrahim, 

 1933 



3. G. sp. 



4. Laevigato-sporites latus sp. nov. 



5. L. pseudothiessenii sp. nov. 



6. L. medius sp. nov. 



7. L. desmoinensis (Wilson and Coe) S. W. 

 and B., 1944 



8. L. minutus (Ibrahim) S. W. and B., 1944 



9. Cirratriradites annuliformis sp. nov. 



10. Endosporites plicatus sp. nov. 



11. Triquitrites spinosus Kosanke, 1943 



12. Calamospora breviradiata sp. nov. 



13. Lycospora punctata sp. nov. 



14. L. granulata sp. nov. 



15. L. parva sp. nov. 



16. Raistrickia sp. 



17. Wilsonia vesicatus sp. nov. 



18. "Spherites" sp. 



19. Gen. nov. (see 5-A coal bed) 



Upper Scottville Coal Bed 5 



The Upper Scottville coal bed, a lentic- 

 ular 1 to 2 inch bed, is exposed in the SE. 

 ]/ 4 NW. 14 SW. V4 sec. 16, T. 12 N., R. 

 9 W., Macoupin County, about 5 feet 6 

 inches below the Scottville limestone. This 

 thin coal bed has great correlative signifi- 

 cance because two specimens of Lycospora 

 granulatus sp. nov. and one of Laevigato- 

 sporites pscudothiessenii sp. nov. were ob- 

 served. This coal bed is the highest strati- 

 graphic position known for either species. 

 Reinschospora punctatus sp. nov. has not 

 been observed from any other coal bed to 

 date. 



The flora of the coal bed w r as diversified, 

 eight genera of spores being represented. 

 On the other hand, only 10 species have 

 been identified. The diversified spore con- 

 tent of this thin bed suggests that had the 

 bed developed to several feet in thickness, 

 many additional species of spores would be 

 present in the coal bed. 



The following genera and species are 

 known from the Upper Scottville coal bed 

 (macerations 571 and 572) : 



5 In an earlier publication (1947) the author used the 

 name Scottville for this bed as suggested by Ball (see 

 previous footnote). 



1. Punctati-sporites orbicularis sp. nov. 



2. P. sp. 



3. Granulati-sporites commissuralis sp. nov. 



4. Laevigato-sporites pseudothiessenii sp. 

 nov. 



5. L. minutus (Ibrahim) S. W. and B., 1944 



6. Endosporites plicatus sp. nov. 



7. Calamospora breviradiata sp. nov. 



8. Reinschospora punctata sp. nov. 



9. Lycospora granulata sp. nov. 

 10. Wilsonia vesicatus sp. nov. 



The dominant genus is Punctati-sporites 

 which constitutes 70 to 80 percent of the 

 total spore content of the coal bed. Punc- 

 tati-sporites orbicularis sp. nov. is the domi- 

 nant species comprising 65 to 75 percent of 

 the total spore content. All other species 

 are essentially minor elements of the flora. 



Trivoli (No. 8) Coal Bed 



The Trivoli (No. 8) coal bed at the 

 exposure near Trivoli in the SW. \/l sec. 

 3, T. 8 N., R. 5 E., Peoria County, is 26 to 

 28 inches thick. It is overlain by eight to 

 12 inches of black shale followed by the 

 Trivoli limestone, which is about 24 inches 

 thick. 



Dunbar and Henbest (1942, pp. 30, 31) 

 record that one of the important faunal 

 breaks in the Pennsylvanian is represented 

 by the change in the Fusulinidae of the 

 Trivoli as compared with those found in 

 lower beds. They recommend (p. 31) 

 placing the Carbondale - McLeansboro 

 boundary at the base of the Trivoli cyclo- 

 them, thus making the Trivoli limestone 

 the first marine limestone of Missourian age 

 in Illinois. 



The small spores also indicate that an 

 important floral break separates the plants 

 of No. 8 coal bed and those of earlier age. 

 Lycospora, which has a continuous range 

 from the basal Pennsylvanian, is absent 

 from No. 8 coal bed and from all coal beds 

 above this horizon which have been in- 

 vestigated. It is rarely present in the thin 

 Upper Scottville coal bed, but is the domi- 

 nant genus of the Scottville coal bed. 

 Laevigato-sporites pseudothiessenii sp. nov. 

 has a known range from the top of the De- 

 koven coal bed to the Upper Scottville bed. 



The disappearance of the genus Lycospora 

 and of Laevigato-sporites pseudothiessenii, 

 a long ranging species as noted above, is the 

 evidence of a decided floral change at 



