56 Cincinnati Society of Natural FTistory. 
relation of Lower Silurian strata use the title ‘‘The Hudson 
River or Cincinnati Period,” but express their preference for 
the second term, the other having been placed first because 
used in previous volumes issued by the Minnesota survey. 
Clarke and Schuchert,* in giving a revised nomenclature of 
the New York series of geological formations, use the term 
Cincinnatian — with the divisions Utica, Lorraine and Rich- 
mond (Ohio and Indiana)— omitting the term Hudson River 
altogether. Rudolf Ruedemany has shown by an exhaustive 
study of the Hudson River beds near Albany, New York, that 
a fault, not hitherto detected, separates the strata of the Hud- 
son River valley from those of the Mohawk valley, and that 
the fauna of the Hudson River beds, mainly graptolites, 
proves to belong to a terrane low in the Trenton, hence the 
name Hudson River is a misnomer 
SUBDIVISIONS. 
1. River Quarry Beds — (Point Pleasant Beds.) 
The Cincinnati anticline, or as Prof. Orton has since wisely 
renamed it, the Cincinnati uplift, is exhaustively treated by 
Dr. J. S. Newberry in volume I, pp. 93-111, of the Reports 
of the Ohio Geological Survey, to which the reader is referred 
for full particulars. 
In the division of work of the second geological survey of 
Ohio Prof. Edward Orton was assigned the geology of the 
southwestern part of the State. In his report he divides 
the Cincinnati group into the Point Pleasant beds, exposed 
in the north bank of the Ohio River in Clermont County, 
about twenty-five miles east of Cincinnati, to which he 
assigned a thickness of fifty feet; the Cincinnati beds proper, 
extending from low-water mark of the Ohio River to the 
highest stratum tound in the Cincinnati hills, comprising 450 
feet; and the Lebanon division, embracing about 300 feet of 
strata, lying between the highest stratum of the Cincinnati 
hills and the lowermost beds of unmistakable Upper Silurian 
age. The Cincinnati beds proper he divided into the river 
* Scie1ce, n. s., X, 1899, pp. 874-878. 
+ Bull. New York State Mus., VIII, No. 42, 1900, pp. 564-568. 
{ Geol. Surv. Ohio, I, 1873, pp. 365-449. 
8 
