DETAILED GEOLOGY OF STEUBENVILLE QUADRANGLE. 
89 
lowed down the run and along the river hills. Its thickness is some¬ 
thing more than 3 feet. 
Middle Kittanning coal. —The small bed between the Roger and 
Lower Kittanning coals was not examined in Knox Township. It 
should outcrop along the river hills west of Calumet. 
Lower Kittanning coal. —This coal bed and the accompanying fire 
clay outcrop in the valley of Croxton Run just west of the railroad. 
From this point they rise to the north and are found above railroad 
grade back of Freemans. 
Intervals between the Ames limestone and Allegheny coal beds .— 
It was not possible to obtain elevations on the different coal beds of 
the Allegheny formation in such horizontal proximity to outcrops 
of the Ames limestone as to permit accurate determination of the dis¬ 
tances between them. By comparison of all the elevations of the 
coals with each other, however, and with the elevations of the Ames 
limestone in Knox and Island Creek townships of Ohio, and Clay 
and Butler townships of West Virginia, results were obtained which 
are given with their probable limits of error in the following state¬ 
ment : 
Distance between top of Allegheny coal beds and top of Ames limestone, Knox 
Toicnship, Ohio. 
Feet. 
Ames limestone to Finley coal_ 246±15 
Ames limestone to Roger coal___ 357 ±15 
Ames limestone to Middle Kittanning coal_ 443±10 
Ames limestone to Lower Kittanning coal- 473± S 
ISLAND CREEK TOWNSHIP, JEFFERSON COUNTY, OHIO. 
Island Creek Township includes most of the drainage area of 
Island Creek and Wills Creek. The geologic section exposed in this 
area includes the lower half of the Monongahela formation, all of 
the Conemaugh, and most of the Allegheny. 
Benwood limestone. —On Norton Hill, in the western part of the 
township, the lower beds of the Benwood limestone show. 
Meigs Creeh coal. —The Meigs Creek coal is found on Norton Hill 
and along the western portion of the ridge road south of Island 
Creek. Its thickness is less than 2 feet. 
Pittsburg coal. —The Pittsburg coal outcrops over the greater por¬ 
tion of the township. In the ridges around the headwaters of Wills 
Creek it is well under cover, and has been opened in many places for 
mining. It rises to the east along the Richmond and Pekin pike, 
and adjacent to Pekin is found only in the high hills. The coal bed 
dips to the south from Pekin to Steubenville, where it is under con¬ 
siderable cover. The bed is of normal thickness, and is accom¬ 
panied by limestone beds and the Rider coal seam. Only one com- 
