60 Cincinnati Society of Natural History. 
IV. Lebanon Beds — (Richmond Group.) 
The upper division of the Cincinnati series was named by 
Prof. Orton the Lebanon beds, with a thickness of nearly 300 
feet. For this name Winchell and Ulrich* have substituted 
the name Richmond group, from Richmond, Indiana, where 
this division is finely exposed, holding that the name Lebanon 
is objectionable, as it was previously applied by Safford to 
Tennessee rocks belonging to the Trenton. Another, per- 
haps more valid objection, is the fact that all the strata in the 
immediate vicinity of Lebanon, Ohio, belong to the Lorraine 
group. The Richmond is not present in the New York 
system, unless a sandstone formation overlying the Lorraine 
shales represents it. 
6. STRATIGRAPHY. 
THE TRENTON PERIOD AT CINCINNATI. 
Point Pleasant Beds. 
The principal exposures of these beds in the vicinity of 
Cincinnati are the outcrop in the south bank of the Ohio 
River, extending from West Covington one mile west to 
Ludlow, which presents the most satisfactory exposure for 
study; an outcrop at the mouth of the Licking River and 
outcrops at various points in its banks for several miles up 
that stream; outcrops in the south bank of the Ohio River 
in Campbell County, Kentucky, from Fort Thomas up the 
river for a number of miles; and in the north bank of the 
Ohio in Clermont County, Ohio, particularly in the vicinity 
of Point Pleasant. 
At Point Pleasant and at several small streams between 
Point Pleasant and New Richmond, quarries have been 
opened in the Trenton, though at present none are worked. 
The Trenton is much thicker here than has been heretofore 
reported; the highest stratum of the Trenton is about 
130 feet above low-water mark of the Ohio. The lowest 50 
or 60 feet are rarely shown, but appear to differ but little 
lithologically from the strata higher up, which have been 
* Geol. Minnesota, III, Part II, 1897, p. ciii. 
12 
