152 GEOLOGY OF ILLINOIS. 



A quarter of a mile up stream the limestone appears in a regular 

 layer, stretching across the bed of a small branch. 



Three miles up stream many fossils were collected, weathered out 

 of the shale beds in a fine state of preservation, including beautiful 

 specimens of Pleurotomaria splucrulata, P. tabulata, Orthoceras, Macro- 

 cheilus paludinaformis and one like the M. primigenius, but with body 

 whorl and spire more elongated ; Goniatites globulosus, Bellerophon car- 

 bonarius, Leda bella striata, N~ucula Ventricosa, Astartella vera, Conularia, 

 Leda Oweni, Euomphahis sub-rugosus, and Polypkemopsis per-acuta. These 

 shales contain round and oblong clay and ironstone concretions. 



In sec. 28, T. 10 JS\, E. 3 W., a few fossils were obtained indicating 

 the presence of the same beds as those last named. 



The upper blue limestone, named above, undulates along East Fork 

 for about eight miles, and I regard it as equivalent to No. 22 of my 

 general section. Near sec. 36, T. 8 S"., E. 3 W., on the east fork of Shoal 

 creek, there crops out eight feet of sandy shale and sandstone. On 

 West Fork, at the bridge on the Hillsboro and Walshville road, there is 

 a bluff of 35 feet of bluish-gray sandy shales, with a thin bed showing 

 markings resembling those of Fucoides cauda galli, and containing one 

 Bellerophon. East of Litchfield, at the creek bluffs, is seen 30 feet of 

 sandy shale, and below that 10 feet of thick bedded sandstone resting 

 on limestone. Four miles up stream this sandstone is quite ferru- 

 ginous at the base and contains many remains of plants, calamites, 

 sigillarice, etc. One mile further up stream there was observed 45 feet 

 of dark-ash micaceous sandy shale. On Five-mile creek, in sec. 26, T. 10 

 jST., E. 5 W., there is 12 feet of sandy shales with a thin bed of partially 

 carbonized wood containing a fossil fern. A quarter of a mile up the 

 creek there is an exposure of 16 feet of olive-drab clay shales with iron- 

 stone nodules. These shales are evidently continuations of the same 

 beds and make the total thickness of No. 26 not less than 85 feet. 



No. 27 to 33 inclusive. — The best exposures of these beds are on Lake 

 Fork and at Litchfield. The section on Lake Fork at the Bond county 

 line, near McCracken's coal, is as follows : 



Ft. In. 



1. Drift slope 20 



2. No. 27 — Lead blue limestone, with ciinoid stems and Athyris subtilita 2 



3. No. 2S.— Coal 2 



4. No. 29— Blue clay shales 10 



5. No. 30— Shales and sbaly limestone abounding in fossils, but many are much crushed, 



including Spirifer cameratus, Productus punctatus, P. Nebrascensis, Spiriferina Keutuck- 

 ensis, Hemipronites crassus, Productus Pratieidanus, Athyris subtilita, Terebratula bovi- 

 dens, Myalina sub-quadrata, a Macrocheilus, a Pleurotomaria, and one fish tooth 4 



6. No. 31— Ash gray limestone, in the lower part there is from one to one and a half feet 



of dark ash colored limestone often traversed by fine lines of calc-spar ; fossils not abun- 

 dant, contains Productus longispinus 13 



7 . Bituminous shale 4 



8. No. 33-Coal No. 11 17 



