212 GEOLOGY OF ILLINOIS. 



About three and a half miles north of Shawneetown the following 

 section was obtained at "Boundpond bill," which forms a part of the 

 ridge or range of hills reaching northward to New Haven on the Little 

 Wabash river : 



Ft. Tn. 



Soil and drift 10 



Shale 5 



Limestone ("Carthage rock ?") 6 8 



Black bi tuminous shale 1 



Coal, No. 9 6 



Shale, in covered space 20 



Reddish schistose sandstone, weathers rough 15 



Argillaceous and siliceous shale 30 



Black sheet y shale 2 



Calcareous shales, with nearly the same species of fossils as are found at Gray ville, 111. and Rusk 

 creek, Posey county, Indiana : Lcda bcOa-striata, Xucula ventricosa, JBeUerophon carbonarius, 

 B.Hontfortianus, B. percarinattts, Macrocheilus primigenius, Myalina sub-quadrata, Pleuro- 



tomaria spkcerulata, P. CrraijVilletuds, and Schizodus Sp ? 6 



Coal, No. 8 3 



Fire-clay 6 



Siliceous shale . 6 



Covered to low water of the pond 10 



10S 9 



The limestone at the top of this section is generally poor in fossils, 

 but it contains at this place large crinoid stems and a few shells ; among 

 which were recognized Produclus longispinus and Atliyris subtilita. 

 The rock is a bard gray limestone which weathers roughly and readily 

 splits up into irregular slabs, with reddish-brown stains of oxyd of 

 iron on the weathered surface It occupies in the geological horizon the 

 position of a similar limestone which is seen opposite Wabash island. 

 on the east side of the Ohio river, in Union county, Kentucky, and at 

 Carthage, one mile below Uniontowu ; it has been designated by Owen, 

 in the Kentucky report, as the "Carthage Limestone." 



At New Haven, on the Little Wabash river, this limestone is seen in 

 the bauk of the river, where the following section was obtained : 



Ft. In. 

 Covered slope to street in New Haven 10 



Limestone "Carthage" 4 to 5 



Black sheety shale 1 6 



Thin coal 3 



Fire-clay and shale 3 



Reddish -gray sandstone ., 4 



Gray micaceous sandstone 4 



Silicious shale 5 



Low water ? 



32 ti 



The limestone has here, also, a paucity of fossils; Productus longisjri- 

 nus and large stems of encrinites only were seen. The thin bedded 

 sandstone of this section extends across the river; and though forming 

 a serious barrier to navigation, furnishes a good foundation for a mill 

 dam, which supplies a valuable and never failing power for manufac- 

 turing flour and for other mechanical uses. 



