A bit outdated but worth reading
http://www.marketwire.com/press-release/grid-petroleum-corp-san-joaquin-basin-resources-inc-update-otcbb-grpr-1523761.htm
Hope you noticed: ?the "underexplored Miocene Monterey formation is easily the largest shale play in the U.S. with 3 billion Bbls proved so far."
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