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" ... streaks of sand even in the producing zone that add further confusion to correlation. There is a shallow sand that is productive of oil in section 27, Martin township that may be comparable to one of the shallow Clark county sands. Its extent is very... "
Economic Geology - Page 576
1912
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Bulletin, Issue 22

Illinois State Geological Survey - Geology - 1913 - 500 pages
...of the shallow Clark county sands. Its extent is very limited. DETAILED STRUCTURE OP THE DISTRICT. Owing to the irregular deposition of sands and shales...definitely except the top lens of the Robinson sand which is somewhat persistent over the area. Even this work loses much of its scientific value because...
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Transactions of the Illinois State Academy of Science, Volumes 5-8

Illinois State Academy of Science - Science - 1912 - 644 pages
...persistent lenses that show an average interval of about fifty feet and a thickness of from two to fifty feet. The lenses often merge into each other and are...to the irregular deposition of sands and shales, it is impossible to correlate and contour any sand beds definitely, except the top lens of the Robinson...
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Bulletin, Issue 22

Illinois State Geological Survey - Geology - 1913 - 510 pages
...of the shallow Clark county sands. Its extent is very limited. DETAILED STRUCTURE OP THE DISTRICT. Owing to the irregular deposition of sands and shales...definitely except the top lens of the Robinson sand which is somewhat persistent over the area. Even this work loses much of its scientific value because...
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Bulletin, Issue 22

Geology - 1913 - 508 pages
...of the shallow Clark county sands. Its extent is very limited. DETAILED STRUCTURE OF THE DISTRICT. Owing to the irregular deposition of sands and shales...definitely except the top lens of the Robinson sand which is somewhat persistent over the area. Even this work loses much of its scientific value because...
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