1056 GEOLOGY OF OHIO.. 
opened on John’s Creek, on Aarons’ Creek, and on Elkins’s Creek. In 
the last-named valley are found the well-known openings of the Oak 
Ridge Furnace, Section 22, Aid township. The coal has been worked 
here in a small way for many years. The structure of the seam is 
shown in the following figure : 
FAGURE Chih 
STRUCTURE OF UPPER FREEPORT COAL 
(WATERLOO SEAM) AT OAK RIDGE FCE. 
am i ee = 4. | 
fire- clay- peek 
The volume, as will be seen, is fully equal to that of the Waterloo 
coal, but the benches are quite differently proportioned. The quality 
of the coal is inferior, so far as present developments enable us to judge. 
The seam is so interrupted by slate and clay banks that it can scarcely 
be made a basis for profitable mining. 
One other section, illustrative of this field, is added. 
In Section 28, Aid township, 2 miles to the southward of Oak 
FiLGURE Suit 
STRUCTURE OF UPPER FREE PORT 
COAL IN SECTION28 AID TOWNSHIP. 
Sandy Shale..... oe 
COGU NS Capi ae eel 
Fone boabs. co i304 E 
eee oo 1 
