subsurface geology and coal resources of the pennsylvanian system ...

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County number: The county number is an identification number
assigned to each drill hole or mine within the county. It is also
recorded on the structure contour map next to the symbol of the
hole or mine,
Type hole: The following symbols have been used to indicate
the type Tf drill hole or mine:
Drill holes (logs are available for examination at the offices
of the Survey):
CH = Churn drill
LD = Rotary drill logged by
PT = Oil test by churn drill the Coal Division as a
DD = Diamond drill
control well
RD = Rod drill GW =-- Gas well
TD = Rotary drill
WW = Water well or other drill
hole
Combination symbols, replacing the second letter of the abbreviations
above, have the following meaning:
-S = Skeleton log -K = Entire log confidential
-C = Thickness of coal -N = No log in Survey files
confidential
Mine s:
SH = Shaft mine
SL = Slope mine
SD = Drift mine
ST = Strip mine
SA = Abandoned mine
OA = Abandoned strip mine
OU = Outcrop information
Operator's name and number: Operator and farm names are
abbreviated to ten spaces. The operator's name is on the first
line, the farm name on the second, each followed by their respective
numbers. CC signifies Coal Company; MC, Mining
Company; OC, Oil Company; etc.
Surface elevation: Surface elevation is given in feet and tenths
of feet, the last digit representing tenths of a foot, as "4326"
means "top of hole is 432.6 feet above sea-level." The Level
Method for determining elevation of top of hole, shaft, etc., is
indicated as follows:
B = Barometer
H = Hand level
C = Company information P = Plane table
D = Company derrick floor Y = Wye level or transit
F = Field estimate using topographic map
T = Topographic map estimate not in field
G = Ground (estimated from instrumentally determined data,
recorded depths modified accordingly)