-35- 



Q_ 



Z) 



o 

 en 



LU 



LU 



UJ 



OAK GROVE LS. MBR. 



MECCA QUARRY 

 SHALE MEMBER 



FRANCIS CREEK 



SHALE 



MEMBER 



5 FT. 



COLCHESTER (NO. 2) COAL 



1. Limestone - brownish gray to gray, 

 hard, massive, crinoidal; contains 

 brachiopods, fusulinids, gastro- 

 pods, and trilobites. 



2. Shale - black, hard, fissile; has 

 pimple structure; contains cono- 

 dont assemblages and fish scales; 

 upper 4 inches dark gray. 



^^^ 3. Shale - black, fissile, soft; limy 

 in lower part. 



4. Limestone - gray, fine-grained, 

 f ossiliferous, discontinuous. 



5. Shale - bluish gray, soft, non- 

 calcareous. 



6. Shale - gray to light bluish gray, 

 noncalcareous, thin-bedded. 



7. Coal - shaly in lowermost part. 



8. Clay - gray and purplish gray to 

 dark bluish gray, noncalcareous, 

 soft, sandy. 



Fig. 17 - RHODES' (1952) LOCALITY 7, cutbank on South Fork Bear Creek. SE^ 

 Sldh Sec. 9, T. 1 N., R. 6 W. , Adams County, Camp Point Quadrangle. 

 This is the topotype locality for Illinella . The section is common- 

 ly poorly exposed. Rhodes' natural assemblages came from the Mecca 

 Quarry Shale Member of the Carbondale Formation. Section taken 

 from notes of S. E. Ekblaw, 1930. 



