SPORE DISTRIBUTION — CHESTER 



75 



/MISSISSIPPI/ 



PENNSYLVANIAN 



(CHESTER / CASEYVILLE / TRADEWATER CARBONDALE x MC LEANSBORO 



SERIES) J GROUP / GROUP / GROUP/ GROUP 



o 



'"MS* 



<Fk* 





/% XXX X X X X X /XXXXXXXXX /XXXXXXXXXXX /X XX X X /XXXXXXXXX 



CYSTOSPORITES 

 TRILETES 



Laqenicula 



CALAMOSPORA 



Zonales 

 Tria ngulati 

 Aphanozonati 



Auriculati 



^PENCERISPORITES 

 MONOLETES 



RENISPORITES 



PARASPOh 



^Lagenicula 1 7 



Text fig. 8. — Generalized stratigraphic occurrence of spores of seven genera and of spores of the five sec- 

 tions of Triletes in upper Mississippian and Pennsylvanian rocks of Illinois and adjacent states. 



Triletes subpilosus forma major (A) 



T. crassiaculeatus (P) 



T. indianensis (C) 



Cystosporites giganteus (P) 



Calamospora sp. (R) 



Megaspores are so abundant in this sample 

 that it could be considered a "spore coal." 

 At least 75 percent of the large spores are 

 those of T. subpilosus forma major. T. in- 

 dianensis accounts for 20 percent of this as- 

 semblage, but is not represented in any of 

 the other samples of the coal in the Bethel 

 (Mooretown) Formation. 



Triletes crassiaculeatus and T. subpilosus 

 forma major also are represented in other 

 samples of this same coal (macerations 468, 

 832, and 834) from Washington and Law- 

 rence Counties, Indiana. T. crassiaculeatus 

 is dominant in one (maceration 832) . Cys- 

 tosporites giganteus also was represented in 

 this maceration. 



In contrast with the Kentucky sample, a 

 2-inch coal (maceration 468) from Wash- 

 ington County, Indiana, contained many 

 spores similar to those found in Bensonites 

 fusiformis (Surange, 1952) , the fructifica- 

 tion of Stauropteris burntislandica. One 

 specimen also was found in maceration 832. 

 Chaloner (1958c) described isolated spores, 

 Didymosporites scotti Chaloner, from the 

 Dinantian and Namurian of Ireland and 

 from the Dinantian of Scotland and Eng- 

 land. An additional sample of coal from 

 the Bethel (Mooretown) Formation (mac- 

 eration 836) was barren of megaspores. 



Middle Chester Series 



No samples were examined from the Cy- 

 press Formation, but megaspores of Tri- 

 letes echinoides Chaloner were found in 

 the uppermost beds of the overlying Gol- 

 conda Formation. These had been picked 



