CARBONDALE GROUP 



73 



19. L. punctata sp. nov. 



20. Raistrickia crinita sp. nov. 



21. R. crocea sp. nov. 



22. Florinites antiquus Schopf, 1944 



Triquitrites exiquus Wilson and Ko- 

 sanke, 1944, is not known to be present 

 above this horizon in Illinois, and Alati- 

 sporites has not been observed in the No. 4 

 coal bed although is known to be present 

 in beds above and below. When Alati- 

 sporites is present in a coal bed it has always 

 been found in either the upper one-half to 

 one-third of the bed. Its apparent absence 

 in the No. 4 bed suggests that the swamp 

 vegetation did not reach that stage of late 

 floral development which is marked by the 

 appearance of Alati-sporites in the upper 

 part of other coal beds. 



The dominant genus in the Summum coal 

 bed is Lycospora followed closely by Laevi- 

 gato-sporites. The remaining genera ap- 

 pear, on the basis of relative abundance, to 

 be minor elements of the flora. 



Harrisburg-Springfield (No. 5) 

 Coal Bed 



The Harrisburg (No. 5) coal bed (Cady, 

 1916) from southern Illinois has long been 

 correlated with the Springfield (No. 5) coal 

 bed (Worthen, 1883) from Sangamon 

 County and western Illinois, a relationship 

 which is substantiated by similarity in their 

 small spore content. Arnold Brokaw 2 like- 

 wise correlated the Harrisburg and Spring- 

 field (No. 5) coal beds. Brokaw's results 

 are included in the present discussion in 

 addition to further information obtained 

 by the author from additional coal samples. 



The No. 5 coal bed is second in com- 

 mercial importance in Illinois to the No. 6 

 coal bed, below which it occurs from 20 to 

 125 feet. In areas where either the No. 6 

 or 5 coal bed is missing, it is important to 

 know which is present in constructing maps 

 delineating the structure and distribution of 

 the workable beds. The plant spores ob- 

 served include guide fossils for the identifica- 

 tion of the No. 5 coal bed. 



The following genera and species have 



2 An unpublished master's thesis on No. 5 coal bed 



which was worked out in conjunction with the Illinois 



Geological Survey and the Department of Geology, Uni- 

 versity of Illinois, 1942. 



been isolated and identified from the above 

 coal bed : 



1. Punctati-sporites fene stratus sp. nov. 



2. P. obliquus sp. nov. 



3. P. verrucifer sp. nov. 



4. P. quaesitus sp. nov. 



5. Granulati-sporites convexus sp. nov. 



6. G. spinosus sp. nov. 



7. Alati-sporites inflatus sp. nov.* 



8. A. trialatus sp. nov. 



9. A. <varius sp. nov. 



10. Laevigato-sporites ovalis sp. nov. 



11. L. pseudothiessenii sp. nov. 



12. L. punctatus sp. nov. 



13. L. robustus sp. nov. 



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

 and B., 1944 



15. L. minimus (Wilson and Coe) S. W. and 

 B., 1944 



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



17. L. vulgaris { Ibrahim) Ibrahim, 1933 

 13. Cirratriradites annuliformis sp. nov. 



19. C. annulatus sp. nov. 



20. Endosporites sp. 



21. E. ornatus Wilson and Coe, 1940 



22. Triquitrites pulvinatus sp. nov. 



23. T. sp. 



24. C alamo spora breviradiata sp. nov. 



25. C. hartungiana Schopf, 1944 



26. C. multabilis (Loose) S. W. and B., 1944 



27. C. flexilis sp. nov. 



28. Lycospora punctata sp. nov. 



29. L. granulata sp. nov. 



30. Raistrickia crocea sp. nov. 



31. R. sp. 



32. Florinites sp. 



33. Schopfites sp. 



34. "Spherites" sp. 



Two species of Alati-sporites appear to 

 be restricted to the No. 5 coal bed, A. 

 inflatus sp. nov. and A. varius sp. nov. A. 

 trialatus sp. nov., Granulati-sporites con- 

 vexus sp. nov. and Raistrickia crocea sp. nov. 

 have not been observed in coal beds above 

 this horizon. All of these forms are guide 

 fossils of this coal bed. 



Alati-sporites reached its maximum abun- 

 dance in Illinois at this time, but this abun- 

 dance is most notable in western Illinois, 

 where 10 percent of the total spore content 

 consists of the genus. In southern Illinois 

 Alati-sporites rarely exceeds three percent 

 of the total spore content. It has not been 

 observed in the lower third of the bed in 

 either southern or western Illinois, and is 

 present only rarely in the middle third of 

 the bed. Laevigato-sporites is the dominant 

 genus, since frequently 45 to 50 percent of 

 the spore content is assigned to the genus. 

 Laevigato-sporites pseudothiessenii sp. nov. 



* Known only from the Springfield (No. 5) coal bed. 



