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and were discovered when drilling for deeper, lighter oil prospects. Not many of those that crop out have remained unknown, but some of those in the shallow subsurface may be still waiting to be discovered.
and were discovered when drilling for deeper, lighter oil prospects. Not many of those that crop out have remained unknown, but some of those in the shallow subsurface may be still waiting to be discovered.
==See also==
==See also==
* [[Historical sources of energy]]
* [[Energy: historical sources]]
==References==
==References==