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These data show the following:
 
These data show the following:
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* Good shales can trap thousands of feet of hydrocarbon column.
+
* Good shales can trap thousands of feet of [[hydrocarbon column]].
 
* Most good sands can trap only [[length::50 ft]] or less of oil column.
 
* Most good sands can trap only [[length::50 ft]] or less of oil column.
 
* Poor sands and siltstones can trap 50–400 ft of oil column.
 
* Poor sands and siltstones can trap 50–400 ft of oil column.

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