McLEANSBORO GROUP 



87 



sec. 16, T. 1 S., R. 12 W., maceration 

 517-A (180-182 feet). 



Carlinville Coal Bed 



The Carlinville coal bed is known from 

 one exposure in the SE. \/ A NE. \/ A NW. ]4 

 sec. 26, T. 12 N., R. 8 W., Macoupin 

 County. It is a thin coal less than two 

 inches thick and lies one to two feet below 

 the Carlinville limestone and thus about 

 18 feet above the No. 8 coal bed. 



The following genera and species have 

 been identified from the Carlinville coal 

 bed from the above mentioned locality : 



1. Punctati-sporites orbicularis sp. nov. 



2. P. obliquus sp. nov. 



3. P. sp. 



4. Granulati-sporites commissuralis sp. nov. 



5. G. sp. 



6. Reticulati-sporites murkatus sp. nov. 



7. Laevigato-sporites ovalis sp. nov. 



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



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

 B., 1944 



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

 and B., 1944 



11. Endosporites vesicatus sp. nov. 



12. E. formosus sp. nov. 



13. Triquitrites spinosus Kosanke, 1943 



14. T. discoideus sp. nov. 



15. Calamospora liquida sp. nov. 



16. C. hartungiana Schopf, 1944 



17. C. breviradiata sp. nov. 



18. Florinites antiquus Schopf, 1944 



19. F. sp. 



20. Wilsonia sp. 



The spore content of this coal bed is 

 similar to that of the No. 8 coal bed with 

 the following exceptions : ( 1 ) the presence 

 of the genus Wilsonia; (2) the presence 

 of Reticulati-sporites muricatus sp. nov.; 

 (3) Laevigato-sporites minutus (Ibrahim) 

 S. W. and B., 1944, is the most abundant 

 species with 20 to 25 percent of the spore 

 population; and (4) Laevigato-sporites is 

 the most abundant genus since 35 to 38 

 percent of the total spore population is 

 found in three species. Calamospora har- 

 tungiana Schopf, 1944, Endosporites for- 

 mosus sp. nov. and Punctati-sporites orbi- 

 cularis sp. nov. comprise about 10 percent 

 each of the total spore population. 



Macoupin Coal Bed 



The name Macoupin is used to designate 

 the six-inch coal bed below an exposure of 

 the Macoupin limestone in the NE. \/ A 



NW. 1/4 sec. 2, T. 9 N., R. 7 W., Macou- 

 pin County. The following genera and 

 species have been obtained from a sample 

 of this bed at the above mentioned locality: 



1. Punctati-sporites setulosus sp. nov. 



2. P. orbicularis sp. nov. 



3. P. latigranifer (Loose) S. W. and B., 1944 



4. P. sp. 



5. Granulati-sporites commissuralis sp. nov. 



6. Laevigato-sporites ovalis sp. nov. 



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



8. Endosporites formosus sp. nov. 



9. E. vesicatus sp. nov. 



10. Triquitrites discoideus sp. nov. 



11. T. sp. 



12. Calamospora breviradiata sp. nov. 



13. C. flava sp. nov. 



14. C. liquida sp. nov. 



15. C. pedata sp. nov. 



16. C. hartungiana Schopf, 1944 



17. Raistrickia sp. 



18. Florinites similis sp. nov. 



Calamospora is the most abundant genus 

 with approximately 32 percent of the spore 

 population. C. hartungiana Schopf, 1944, 

 C. liquida sp. nov., and C. flava sp. nov. 

 represent 10, 10, and six percent of the 

 spore population respectively. C. flava sp. 

 nov. is the most important since it is readily 

 recognized and appears restricted to this 

 bed. Laevigato-sporites is represented by 

 L. ovalis and L. minutus (Ibrahim) S. W. 

 and B., 1944, which accounts for 18 and 

 10 percent of this spore population. Punc- 

 tati-sporites represents about 24 percent of 

 the spore population which is divided equal- 

 ly among the species listed above. The 

 remaining genera and species are not nu- 

 merically important. 



The Macoupin limestone, according to 

 Simon and Cady, G lies between the Carlin- 

 ville and Shoal Creek limestone. Identifi- 

 cation of the Macoupin coal bed outside the 

 type area will not be possible until samples 

 from closely spaced localities have been ex- 

 amined to determine the lateral abundance 

 variations of the spore population. A coal 

 bed core obtained from a diamond-drill core 

 at 303 feet 10 inches to 304 feet 2 inches 

 located in Jefferson County (maceration 

 538-F) contains Calamospora flava sp. nov. 

 which indicates similarity in stratigraphic 

 position. 



6 "Stratigraphic position of the Shoal Creek and Carlin- 

 ville limestones in southwestern Illinois," paper presented 

 to the Paleontology and Stratigraphy Section, Annual 

 Meeting of Geological Society of America, Chicago, Dec. 

 1946. 



