An Account of the Middle Silurian A'ochs of Ohio and Indiana. 



193 



36. Elkhorn Falls. — About 4 miles nearly south of Richmond 

 are found the Elkhorn Falls. The Falls themselves are composed of 

 the Clinton formation which at this point is 14^3 feet thick. Below 

 the Clinton the firm greenish blue Belfast clay rock is found with a 

 thickness of 1 5 inches. Underneath this is found a shaly blue clay, 

 about 3 feet thick under which is seen the ordinary Cincinnati lime- 

 stone with Strophomena altcmata. Over the Clinton is found the 

 Dayton limestone, which is softer near the base, firmer and more blue 

 farther up The total thickness of Dayton stone exposed here does 

 not exceed 3 or 4 feet. 



In the Clinton were found like mis daytonensis, glabella and 

 pygidium, Ilhcmis am&tguus, pygidium, Dalmanites werthneti t pygidium, 

 Orthis calligramma ) Orthis biforata, few plications, Orthis elegantula, 

 Strophomena patenta y abundant, and Favosites niagarensis. 



The Clinton here is often a whitish, bluish, or reddish very pure 

 limestone, like the upper half of the limestones at Soldier's Home 

 Ohio. 



37. Ldngwood. — 6 miles west of Connersville on the Cincinnati, 

 Hamilton & Indianapolis Railroad. 



a. Ball's quarry. — This quarry is found along the creek west of 

 the railroad station. It is the most northern of a group of quarries 

 opened along the creek. The Clinton here is about 11^3 feet thick. 

 It is a hard blue sandy siliceous rock, very different from the ordinary 

 Clinton away from some of the eastern exposures in the region of 

 the Clinton conglomerates. It contained Leptcena rhomboidalis, an 

 obese form of Atrypa marginalis, PhyUoporina angulata, Pachydictya 

 rudis, Rhinopora verrucosa, Heliolites subtubulatus, Striatopora flexuosa, 

 and Halysites catenulatus. Underneath the Clinton occurs a layer of 

 hard limestone rock, 8 inches thick, with abundant specimens of 

 both valves of Orthis occidental is, and of various Cincinnati Group 

 bryozoans. Underneath was a blue clayey shale. Chert beds occur 

 in the Cincinnati about 20 feet below the base of the Clinton. 



Above the Clinton occur 6 feet of rock too soft to be used for 

 building purposes and hence not quarried. It is of a yellowish color. 

 In the lower part of this rock occurs a layer containing numerous 

 specimens of Orthoceras. Above this occur a little over 4 feet of a 

 blue flagging stone, free of chert, and constituting the chief part 

 quarried for use. This, with the 6 feet of softer rock already men- 



