88 GEOLOGY OF OHIO. 
The chief difficulty has been that the Cambridge coal exists in fine 
development at short distances, in almost all directions, and the con- 
clusion that one of these thin and worthless beds must be taken for its 
representative here has been an unwelcome one. But the Upper Free-. 
port coal is everywhere unsteady in volume, and there is no large terri- 
tory of it without many interruptions and “ wants.” 
The same section can be found in the hill directly south of the 
town. The Cambridge coal has been opened here 18 inches in thick- 
ness. The interval from the coal to the Cambridge limestone is 137 
feet at this point ; the coal is about 100 feet above Will’s Creek. 
Cambridge is situated at the axis of one of the low arches that 
traverse our coal field. All of the beds dip gently to the east and west. 
The true direction of the dip is probably southeast and northwest, but 
the valleys are so cut as to show the east and west elements of it most 
conspicuously. The coal, which, as has been said, is 100 feet above the 
creek, comes down to nearly the creek level at Cassell’s Station, 5 miles 
westward, and to the same level a few miles east of Cambridge. 
The Upper Freeport coal (Cambridge seam) exists in fair de- 
velopment at Cassell’s Station. For 30 years it has been mined for, 
local supply on the Farrar farm, where it is scant 3 feet in thickness. 
On the adjoining farm of Steele, Lanfesty and Ringer, the coal has been 
recently opened, and a peculiarity of the seam through a considerable 
amount of adjacent territory is well displayed. The seam is here 
doubled, showing the following structure : 
IN Lbs 
Sand-rock, Mahoning, pebbly. 
Black and blue shales, with bands of heavy ore (2 to 6 ft.)......... 2 
COal tis ceces cae dincectyaaewahede coelsoueeaesesindne cctme as ee aseaetee acti aaceeeeeee 7 
4 IRIERHGIE RS INEWREL 200000090000000600500000060 009900 05990009000009000000900000000%5 1 4 
| Coal, INCE NAY ELA! TTY SUITES) 5959c0'0000000000000500000000000000999600800 90055600" 2 
This marked feature helps greatly in identifying the seam to the 
northward. It is found in a number of mines in Liberty township, and 
has aided in the identification of isolated exposures. 
The limestone is due near the level of the lower coal. Jt may be 
replaced by this lower bed. 
The Cambridge limestone is found at a proper elevation above the 
coal. The section is as follows : 
