106 ILLINOIS ACADEMY OF SCIENCE. 



ventral margin of the valves was slightly greater than the trans- 

 verse measure. Faint lines radiated from the umbo and distinct 

 concentric lines of growth are seen. Irregular minute tubercles 

 appear on the outer part of the valves. This black shale appears 

 as a yellow translucent mass in transmitted light under the lens. . . 511 



A highl}- bituminous limestone, most of which ef?ervesces briskly with 

 acid. Some effervesces hardly at all. Some of the sample is 

 crystalline calcite, and some bituminous fragments burn, when 

 ignited, for a few seconds. The label on the sample was blurred, 

 5?1, but its highly bituminous character makes it probable that it is 

 from about the same depth as the previous sample. Near (?) 511 



Green clay shale, not effervescing in acid 600 



Greenish gray shale of very fine plastic texture, effervescing slightly 

 with acid, containing a valve of an Estheria? Label indistinct; 



680 or 683 683 



Under this there was 270 feet of limestone, probably partly 



Devonian and partly of Trenton age. 



THE PEORIA GLEN OAK PARK WELL. 



This well shows 150 feet of drift, 250 feet of coal measures, 



125 feet of Alississippian limestone, and under this 195 feet of 



shale, of which at least the lower 70 feet are to be correlated with 



the Sweetland Creek shale. This rests on calcareous limestone 



believed to be of Devonian age. The samples examined were as 



below : 



Depth from below Surface 

 from to 



Greenish gray shale with fragments of sponge spicules. 

 Some fragments of a bluish translucent rock 

 show a network of imbedded spicules (Kinder- 

 hook?) 525 590 



Gray, slightly micaceous shale with crystals of pyrite 



and indistinct specimens of Sporangites huronense 590 650 



Like the preceding, with frequent specimens of Spor- 

 angites huronense 650 720 



THE JUNCTION MINING COMPANY DRILL BORE NEAR SPRINGFIELD. 



A core from a diamond drill coal test sunk 1,500 feet below the 

 surface near Springfield shows the presence of 231 feet of shale, 

 underlying a reddish limestone recognized as the Kinderhook 

 shaly limestone. The uppermost 97 feet of this shale contains 

 some fine oolitic rock and has been referred by Prof. J. E. Savage 

 to the Kinderhook. The lower 133 feet is no doubt to be corre- 

 lated with the Sweetland Creek shale. It contains Sporangites 

 huronense and also a Lingula. It is separated from an underlying 

 limestone by a sharply defined limit, and the uneven upper surface 

 of this limestone bears a striking resemblance to the unconform- 

 able upper surface of the Cedar Valley limestone, in Muscatine 

 County in Iowa, including the presence of worn fragments of 

 indistinct fish teeth. 



