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

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122 ILLINOIS BASIN COAL RESOURCES<br />

S ELF-POTENTIAL<br />

RESISTIVITY<br />

- cC0- t 0 20 40 60 80<br />

1 1 1 1 1 1 1 1 1 1 1 1 4 1 1 1 1 1<br />

I.! ILLIYOLTS OHMS M ~ M<br />

S ELF-POTEN TIAL<br />

RESISTIVITY<br />

-+40++ 0 20 40 60 80<br />

I I , , , , i L 1 I,,,f--7--T--r--1<br />

lvl ILLIVOLTS OHbS M ~ M<br />

BASE OF PENNSYLVANIAN NOT DEEPER THAN 2320 FT.<br />

Frc. 30.-Stratigraphic succession <strong>and</strong> electric logs <strong>of</strong> rotary-drill hole Sohio-Heap No. 1 (Richl<strong>and</strong><br />

County No. 9) from 150 to 2000 feet. A.bove SlO feet stratigraphy is interpreted from<br />

electric logs; from 810 to 2000 feet, stratigraphy is based on drill cuttings <strong>and</strong> drilling time.

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