(Review of decent Geological Literature. 
59 
•citizens of Ohio, looking for practical information and tangible results 
these economic investigations will possess the greatest interest and 
value; but to the Geologist at large, the first chapter, "The Geology of 
Ohio Considered in its Relations to Petroleum and Natural Gas," will 
sound the key note and absorb most attention. 
Prof. Orton has made considerable changes in the geological column 
as previously published in the Ohio Reports. Following is a table of 
Newberry's arrangement (Ohio reports, i 88) set side by side, for easy 
.comparison, with Orton's present arrangement. 
NEWBERRY. 
ORTON. 
Upper Coal Measures. 
Upper Barren Coal Measures. 
n 
Barren Measures. 
Upper Productive Coal Measures. 
a 
Lower Coal Measures. 
Lower Barren Coal Measures. 
o 
Conglomerate. 
Lower Productive Coal Measures. 
t2- 
Lower Carboniferous limestone. 
Conglomerate. 
'2 
Cuyahoga shale. 
Sub-carboniferous limestone. 
o 
( Shale. 
Logan. .< Sandstone. 
Waverly ....^ Berea grit. 
Bedford shale. 
( Conglomerate. 
I Cleveland shale. 
Waverly 
Cuyahoga shale. 
Berea shale. 
Berea grit. 
Erie shale. 
Bedford shale. 
Huron shale. 
Hamilton. 
c 
o 
> 
CornifproiK? iSandusky limestone. 
Corniferous .. iColumbus limestone. 
f Cleveland shale. 
Ohio shale <Erie shale. 
■« 
Oriskany sandstone. 
(Huron shale, 
Hamilton shale. 
Helderberg— Waterlime. 
Devonian limestones. 
1 
Salina shale. 
Lower Helderberg limestone. 
Hillsboro sandstone. 
Hillsboro sandstone. 
u 
a. 
Niagara Niagara sandstone. 
^ Niagara shale. 
Dayton stone. 
Niagara <5uelph sandstone. 
jNiagara... ^Tj^gj^^g^ limestone. 
Niagara shale— Dayton stone. 
Clinton. 
Medina. 
Clinton. 
Medina. 
3 
(Lebanon beds. 
Hudson River series. 
02 
Cincinnati group ■ Eden shales. 
Utica shales. 
v4 
(Point Pleasant beds. 
Trenton limestone. 
Beginning at the bottom the first change we observe is the omission 
of the Cincinnati group, a term so familiar in the geology of the great 
interior of North America that its absence occasions a slight pang. It 
was used by Meek and Worthen to designate the western equivalents of 
the Hudson and Utica shales; and Newberry added the Point Pleasant 
beds which belong to the Trenton. Orton finds the Utica shales absent 
at Cincinnati; though they prevail widely in northern Ohio, as shown 
by the numerous deep borings for gas and oil, and, relegating the Point 
Pleasant beds to the Trenton, the remaining element of the Cincinnati 
group is simply the Hudson river shales. The Cincinnati group is there- 
fore dropped as being synonymous with Hudson, which has the priority. 
The only weak noint in this reasoning is that the Utica may not be 
