I04 Cincinnati Society of iWitural History. 



As far as present information goes, there seems to be no more 

 reason for assigning the Point Pleasant Beds to the Trenton, 

 than there would be in making a similar disposition of the 

 lowest beds at Cincinnati. 



During the same season a visit was made to Ludlow, Ken- 

 tucky, opposite Cincinnati, where the lowest beds of the vicin- 

 ity are exposed. The water was higher than it had been when 

 Point Pleasant was visited, but from previous knowledge I can 

 say that the rocks exposed even at extreme low water, do not 

 differ materially from those seen on this visit. Nor do they 

 differ from the lower strata at Point Pleasant, except in being 

 more extensively exposed. One section having a vertical 

 height of from 25 to 30 feet was seen in the bed of a small run, 

 and the two views on plate 4 show the character of the ex- 

 posure from bottom to top. There are alternations of lime- 

 stone and shale, some of the former being quite heavy, from 

 8 to 12 inches thick, and conspicuou.sly waved. They are also 

 covered with inorganic or the so-called "fucoidal" markings. 



The conclusion is reached, after a study of the Point Pleas- 

 ant section, and a comparison with the lowest layers as seen 

 cfn the Ohio at Ludlow, Kentucky, that there are neither litho- 

 logical, paleontological, nor sedimentary characters, by which 

 to place the two series in two different terranes, unless an 

 arbitrary line be drawn between them; and while there is and 

 can be no question as to the existence of the Trenton lime- 

 stone beneath a large part of the State of Ohio, there is no 

 good reason to say that it outcrops at the surface in any local- 

 ity within her l)orders. 



