36o The American Geologist. December. i904. 
about sixty feet below the base of Conglomerate I, at which 
horizon is the most marked lithologic change in the rocks, 
and the base of these sandstones has been selected as the line 
of division between the Black Hand and Cuyahoga formations. 
In the quarries southeast of Newark the most marked litho- 
logic change in the upper part of the formation occurs at the 
top of the massive freestone (No. 5). In professor Hicks' or- 
iginal description of the formation he included in it, overlying 
the compact drab sandstone, a "Fucoid layer" seven to twelve 
feet in thickness and a "coarse sandstone and conglomerate" 
three to eighteen feet in thickness.* It is thought that the Fu- 
coid layer represents the Allorisma shale of Herrick and the top 
sandstone and conglomerate Herrick's Conglomerate II. For 
the above reason, Conglomerate II has still been considered in 
the sections of the Newark quarries as the top of the Black 
Hand formation. 
The continuation of the section from Havens' quarry is to 
the eastward up "the gorge," which is the stream that joins 
Quarry run some rods to the north of the quarry, along which 
is shown, according to the barometer, about ninety feet of buflf 
arenaceous shales to thin bedded sandstones to the base of the 
Sharon conglomerate. The shales predominate in the lower 
thirty feet of the section and apparently about the lower ten 
feet are shown in the upper part of the Havens' quarry wall. 
These rocks and those of the Havens' quarry succeeding Con- 
glomerate II or No. 7. are referred to the Logan formation 
which has a tliickness in this section of about 115 feet. 
The thickness of ioo>2 feet for the Black Hand formation 
in the above section agrees closely with that of the formation 
in the vicinity of Clay Lick, seven miles east of the Newark 
section. On the Bell farm one-half mile east of Clay Lick, the 
formation is well exposed on the point just east of the house. 
The barometer gave 85 feet from the B. & O. railroad up to 
the top of the ledge of coarse grained rock (mainly grit) with 
some pebbles which are arranged somewhat in layers and occur 
from the top to the bottom. It is mainly of yellowish color, 
but with some brownish and an occasional reddish layer. In 
the creek at Clay Lick are coarse sandstones apparently be- 
longing in the Black Hand formation which barometrically 
" Amer.Jour. Sci., 3d ser., vol. xvi, 1878, p. 218. 
