26 BuLIvETIN 12 154 



tyon probleniaticum r,Polypora sp.c, Proe^us crassbnarghiatus c,Spir- 

 i/er sp. r, Spirifer acimiiyiatiLs r, Spirifei' byrnesir, Spirifer gregar- 

 iicsz., Spirifer iozvejisis, Spirifer raricostusf r, Spirifer varicosiis r, 

 Streptoi'hynclncs ar^osiriatits r, Stropheodonta demissa c, Stropheo- 

 donta hemispherica r, Stropheodonta perplana r, Tcrebratula linck- 

 lcs7ii r, Zaphrentis sp. c. 



Brooks Section. 



A generalized secftion of the rocks in the vicinity of Brooks 

 station, which is about fifteen miles south of lyouisville, is as 

 follows: 



Massive sandstone 40-50 ft. 



Sandy shale and sandstone 50-75 ft. 



Blue clay shale 50-65 ft. 



Black to chocolate colored shale 15-30 ft. 



Devonian limestone 2 -6ft. 



Niagara limestone and sandstone 15-20 ft. 



The Black shale was found to rest unconformabh' on the De- 

 vonian limestone in the vicinity of Brooks. In the bed of Brooks 

 run, between the railroad and the wagon road, the lower strata 

 of the Black shale lie in shallow, irregularly eroded pockets in 

 the limestone. In some of these a thin layer of reddish claj^ was 

 observed between the limestone and the undisturbed Black shale. 

 The unconformity observed here is shown in the accompanying 

 figure (Fig. i). . 



40 



FIG. I. — SeFlion on Broo/cs Run, Bullitt County, Kentucliy. 



