10 F. Leverett—Oorrelation of New York 
such material from low to high altitudes and occasionally, 
where water was abundant, has formed deposits which closely 
resemble beaches. Such deposits are, however, rare in this — 
district. Mr. Gilbert has noted places south of Hamburg 
which seemed to show wave action at about the level of the 
Sheridan beach, but the action was so obscure that he enter- 
tains only a suspicion not a conviction. In case Mr. Gilbert’s 
suspicions are confirmed, the connection with the western end 
of the moraine may be very close. 
The Crittenden Beach.—The Crittenden beach was studied 
in detail by the writer only from Hamburg eastward. For 
this reason, and because its eastern terminus is a matter of 
especial interest, the discussion is confined mainly to that part 
of the beach. The course of the beach is quite definitely 
known from Cleveland eastward, being nearly parallel to, and 
but a short distance from the present shore of the lake. The 
portion eastward from Hamburg extends beyond the present 
shore, but the extreme eastern terminus is not more than 30 
miles distant from the lake. Westward from Cleveland it is 
found within 80 miles from the lake throughout its course in 
Ohio. | 
This beach is not confined to a simple ridge but consists of a 
system of ridges closely associated. The vertical range, at 
some points between the highest and lowest members of the 
system, is about 30 feet, and a range of 20 feet iscommon. In 
his discussion of the portion at the western end of Lake Erie, 
Mr. Gilbert notes a range of 25-30 feet, the highest members, 
or upper limit of deposits being 90, and the lowest 60-65 feet 
above the present lake level.* In his discussion of the por- 
tion near Cleveland Dr. Newberry notes a similar range, the 
highest point being 118 feet and the lowest 95 feet above the 
lake.t In the eastern part there is a range of at least 25 feet 
and possibly more. 
In the table of altitudes given above the upper limits of the 
beach are taken wherever practicable, but in some instances it 
is uncertain that the highest member was found. At Oritten- 
den only the lower members are present, the higher having 
terminated near Alden, as shown below. , 
Between the upper limits of the Crittenden and lower 
limits of the Sheridan beach there is usually a space of about 
50 feet where beach ridges are rare. The observations taken 
are not sufficiently full nor refined to make it clear whether or 
not a measurable amount of differential uplift took place 
between the formation of the Sheridan and Crittenden beaches. 
The amount since the date of the Crittenden is certainly closely 
similar in the two beaches. 
* Geol. of Ohio, vol. i, 1873, p. 554. 
+ Geol. of Ohio, vol. ii, 1874, p. 59. Also map, p. 59. 
