GENERAL STRATIGRAPHY OE THE REGION. 
81 
from a bed 5 feet thick in one locality to a mere streak of coal a few 
miles away. Usually this coal is underlain by limestone and overlain 
at a distance of a few feet by a heavy sandstone. 
ROGER (UPPER KITTANNING) COAL. 
The Roger coal bed occurs about 100 feet> below the Finley coal. 
Considerable uncertainty exists regarding the correlation of this coal 
bed with the type section of Pennsylvania. Orton a considered that 
it was equivalent to the Lower Freeport of Pennsylvania. From data 
collected during the present survey, especially in the valley of Kings 
Creek, West Virginia, it seems probable that this coal bed does not 
maintain regular distances to the coal and limestone beds above and 
below, but that it varies within rather wide limits, while the interval 
between these coal and limestone beds remains constant. The coal 
is from 3 to 4 feet thick and has a parting 14 to 1G inches from the 
bottom. It is of good quality and has been extensively mined. Gen¬ 
erally the bed is overlain by light-yellowish shale, which changes to 
sandy shale above. 
MIDDLE KITTANNING COAL AND ASSOCIATED ROCKS. 
From 80 to 100 feet below the Roger coal is the Middle Kittanning 
bed. This attains in but few places a thickness of 3 feet. It. appears 
to be of fair quality, but is not extensively mined. Overlying the 
coal is a heavy bed of light-colored sandstone that has a thickness 
of 50 to 80 feet. Below the Middle Kittanning coal is a sandstone 
15 to 20 feet thick, which reaches within a few feet of the Lower 
Kittanning coal. These two sandstones, one above and the other below 
the Middle Kittanning coal bed, probably represent the first and 
second Cow Run sands noted in many well records. 
LOWER KITTANNING COAL AND FIRE CLAY. 
The Lower Kittanning coal is from 2 to 3 feet thick and is under¬ 
lain by a bed of fire clay from 8 to 12 feet thick. The coal is high in 
sulphur and is sometimes spoken of as the “ sulphur ” bed. The clay 
varies considerably in appearance. The upper portion is of a light 
cream color in outcrop; the lower has disseminated through it crys¬ 
tals of pyrites that give it a yellow appearance on weathering. On 
fresh fracture the upper portion is of a light dove color, breaking 
with uneven fracture and having a soapy feel. The lower portion is 
much darker, though giving a very light streak. 
« Orton, Edward, Geol. Survey Ohio, vol. 5, 1884, pp. 49-62. 
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3496—Bull. 318—07 
