COAL MINES OF JACKSON COUNTIES. 1025 
The numerous blast furnaces of the county have brought it about 
that the seams of ore are much more widely worked and much better 
known than the coal seams. The former therefore dominate the sections, 
and the measurements are commonly made from them. 
Two ore seams in particular constitute the chief guides for inves- 
tigation as well as the chief bases for measurement, viz., the limestone 
ore carried by the Ferriferous limestone, and the Franklin or Big Red 
Block ore, which lies about 100 feet below it. The order of the coals 
is as follows: 
(Above) 120-150 ft., Upper Freeport coal, No. 7. 
65-90 ft., Lower Freeport coal, No. 6a. 
35-70 ft., Middle Kittanning coal, No. 6. 
10-20 ft., Lower Kittanning coal, No. 5. 
Ferriferous LInmestone Ore. 
(Below) 0-15 ft., Clarion (Upper) coal. 
30-50 ft., Brookville coal, No. 4. 
Interval, 100-120 feet. 
Franklin Block Ore. 
(Above) 10-20 ft , Tionesta coal, No. 36. 
(Below) 0-20 ft., Upper Mercer coal, No. 3a. 
40-60 ft., Lower Mercer cal, No. 3. 
Two or three measured sections are here inserted to illustrate the 
geology of their general districts. 
There are a number of elements well shown in the immediate 
vicinity of Madison Furnace. The order isas follows: 
Coal blossom and clay, Lower Freeport, No. 6a. 
Sandstone, soft, yellow, massive, Freeport............sececeseeoeee 17 feet. 
Coal, Middle Kittanning, 12 to 14 inches, No. 6..............0..0005 556000006 Luss 
White clay and sandy shales with kidneys of ore............... Gi 
Coal, Lower Kittanning, No. 5, 12 to 32 inches.............cse0-seseeseseeees eee 
\WV oti GE, CIE RIMES) 500000005 000000000 600000 300500000 003600000000000005 0 
Ferriferous limestone, with its ore. 
Coal, Clarion, 3 to 5 feet, below limestone. 
Hecla sandstone, massive and constant. 
(Furnace cut out of solid rock). 
At Keystone Furnace the following section was obtained : 
Sandstone, 20 feet, seen. 
‘Coal blossom (Brush Creek, No. 3) .........0008 RS MRS ERA ci oy 233 ft. 
Interval, not seen. 
65 G. 
