72 



PENNSYLVANIAN SPORES OF ILLINOIS 



ments in approximately the same abundance 

 as the thicker No. 2 coal bed from western 

 and northern Illinois. The zonation of 

 Schopfites' in the lower portion of the bed 

 and Alati-sporites in the upper third of the 

 bed was observed in No. 2 coal bed in 

 southern Illinois. 



The floral development of No. 2 coal bed 

 is of considerable interest because the bed 

 is widespread, and therefore to account for 

 the zonation of various genera significant 

 changes must have occurred in the flora 

 during the period of accumulation of the 

 bed. The parent plants of the following 

 genera of spores are considered as early 

 invaders since they have been isolated from 

 the bottom third of the bed: 



1. Punctati-sporites 



2. Granulati-sporites 



3. Laevigato-sporites 



4. Cirratriradites 



5. Endosporites 



6. Triquitrites 



7. Calamospora 



8. Lycospora 



9. Raistrickia 



10. Florinites 



11. Schopfites 



12. Wilsonia 



The middle third of the bed contains the 

 same genera listed above except that Schop- 

 fites is very rare and Laevigato-sporites, 

 Lycospora, and Punctati-sporites have ma- 

 terially increased in abundance. The upper 

 third of the bed apparently lacks Schop- 

 fites, and Alati-sporites appears to be re- 

 tricted to this portion of the coal bed. 

 Laevigato-sporites and Calamospora reach 

 their maximum abundance but Lycospora 

 is much less abundant than in the middle 

 and lower thirds of the bed. The No. 2 

 coal bed is readily identified by plant spores 

 as indicated by the following species which 

 are restricted to this bed in the samples 

 studied: Punctati-sporites reticuloides sp. 

 nov., Schopfites dimorphus sp. nov., and S. 

 colchesterensis sp. nov. In addition, nine 

 species appear to originate or terminate their 

 geological range with the No. 2 coal bed, 

 and these are indicated on the genera and 

 species list of the coal bed and in the spore 

 distribution chart. 



Summum (No. 4) Coal Bed 



The Summum (No. 4) coal bed, near 



Summum, Illinois, according to Wanless 

 (1939), is exposed in Woodland Township 

 (T. 3 N., R. 2 E.), Fulton County. Here 

 the No. 4 coal bed is overlain by a black 

 shale which contains large calcareous con- 

 cretions. In Greene and Jersey counties 

 the No. 4 coal bed is overlain by black shale 

 and the Hanover limestone (Wanless, 

 1939, Payne, 1942). Wanless (1939) be- 

 lieves the calcareous concretions in Fulton 

 and Peoria counties are at the same posi- 

 tion as the Hanover limestone. The coal 

 bed below the Hanover limestone contains 

 the same small spore population as the 

 Summum (No. 4) coal bed, and the two 

 beds are therefore correlated. 



The Summum (No. 4) coal bed appears 

 to be represented in southern Illinois by a 

 coal bed in Williamson County lying below 

 the Harrisburg (No. 5) bed. However, 

 additional comparative studies of the No. 

 4 coal bed from both western and southern 

 Illinois are necessary before a definite corre- 

 lation is made. Abundance variations and 

 genera and species zonations must be clear- 

 ly understood before attempting to extend 

 the known distribution of the bed. 



The species content of this bed is small 

 when compared with that of either No. 2 or 

 No. 5 coal beds possibly because of the 

 small number of samples examined. 



The following genera and species have 

 been identified from the No. 4 coal bed in 

 Fulton and Jersey counties (macerations 

 541 and 463): 



Punctati-sporites fenestratus sp. nov. 



P. obliquus sp. nov. 



P. verrucifer sp. nov. 



P. quaesitus sp. nov. 



Granulati-sporites convexus sp. nov. 



G. verrucosus (Wilson and Coe) S. W. 



and B., 1944 



Laevigato-sporites pseudothiessenii sp. 



nov. 



L. punctatus sp. nov. 



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



and B., 1944 



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



B., 1944 



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



Cirratriradites annuliformis sp. nov. 



C. annulatus sp. nov. 



Endosporites ornatus Wilson and Coe, 



1940 



Triquitrites pulvinatus sp. nov. 



T. exiquus Wilson and Kosanke, 1944 



Calamospora breviradiata sp. nov. 



Lycospora granulata sp. nov. 



