COAL. 103 
Analysis of Redstone coal from bank near Monongaliela. 
[A. S. McCreath, analyst.] 
Moisture 1. 0(10 
Volatile matter 33. 590 
Fixed carbon 48. 688 
Ash... 14.295 
Sulphur 2.367 
Percentage of coke 65. 350 
Color of ash, gray. 
100. 000 
SEWICKLEY COAL. 
The Sewickley coal is frequently reported in well records at dis- 
tances varying from 100 to 150 feet above the Pittsburg coal and near 
the base of the Benwood limestone. To the drillers it is universally 
known as the "Mapletown coal," the name coming from Mapletown, 
Greene County, where the bed is mined. In some parts of Greene 
County it is a valuable coal, but in the Amity quadrangle little is 
known regarding it. 
THICKNESS AND INTERVALS. 
On Mingo Creek, near the boundary between Carroll and Notting- 
ham townships, this coal has been opened at two country banks. A 
measurement at one of these gave 28 inches of clean coal, with a fire- 
clay roof (fig. 6, section 18). This coal appears in blossoms at several 
points within a distance of 1J miles up the main branch of this creek 
and 2 1 miles up the run entering Mingo Creek from the northwest. 
At a number of points in the vicinity of Hackett and Finleyville a 
good coal has been opened at country banks 50 to 80 feet above the 
Pittsburg, and this may possibly be the Sewickley; it is, however, con- 
sidered as more probably the Redstone. In the northwestern part of 
the quadrangle the Sewickley is extremely thin. In the Enterprise 
shaft only 3 inches was found, and in the Washington shaft it is 
missing. 
The Sewickley coal is reported in a number of wells drilled in the 
quadrangle for oil and gas, and in order to show the intervals and 
thickness these are tabulated on the next page. 
