292 GEOLOGY OF OHIO. 
Coal of Norris’minmesc7e i recs icccsch cs cee eet eee cee Sen Ee een ERE ERO Lord 
IW OIStUTE 5 cocectversos cok colonies ate nes EO orc eat Don eae beROLo dae Gobob sa 2.91 
Volatiles attenire er ivcg cccaceisswedee tains ee pes cteedes cere ey ee neen eee 37.84 
Fixed CArDOm seer o isc ovnciecseeeese cove seelen an ectenes eee cae women 51.07 
ASD sas Sec Seer Ren Ce rec ain eo be Coan eee le Se ean sae en Ree 8.18 
100.00 
Sul ph urpeercet.cs.csccccececssess eas cuscsaacncseweveSacncds seuncupeceermens 3.13 
The Scott mines that come next below are located in Cambridge 
township, and are among the oldest mines of the district. The Salt 
Works located here antedate the railroad by many years, and a con- 
siderable acreage has been devoted to them alone. The conditions are 
the same in all particulars as in the Norris mine, except that not as 
much trouble has been met in the working of the coal. ‘The structure 
of the coal is shown in the following diagram : 
FLEUR won 
STRUCTURE OF CAMBRIDGE COAL SEAM 
AT SCOTTS SALT WORKS 
Biwe Sivoo: 4027 ———— 
The. fire-clay floor is somewhat troublesome in this mine. The 
roof is hard and heavy, and unless very large pillars are left the floor 
rises at once. Pillars of 40 feet have given way once and again, and 
there are now left pillars of 90 feet. It is estimated that 18 inches of 
the seam under ordinary mining turn into slack, which has, at present, 
no market. 
In some of the sandstone troughs encountered, all of the coal has 
disappeared. The Upper Freeport limestone is always present in the 
clay below the coal. 
The Cambridge Coal Company’s mine is next below, and the 
Guernsey mine completes the list on Leatherwood Creek. These four 
