Considerable evidence has been presented from time to time in various geologic publications favoring the accumulation of oil derived from "local rich accumulations of organic matter deposited in restricted areas near to, indigenous to, or in contact with the reservoir and trap." Opposed to this view, other authors have favored substantial migration, either lateral or vertical, or both.

Evidence is presented strongly supporting, if not conclusively proving that oil, when provided the proper avenue for underground movement, does migrate laterally over distances of several miles. Nothing is implied to indicate that oil may not have accumulated locally, having been derived from restricted areas, underground stratigraphic, and structural conditions being the governing factors at all times.

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