There is an estimated three to five trillion - that's Trillion - barrels of oil equivalent that exists in the continental United States.  

For example, the Monterey oil shales in California contain 500 billion barrels of oil in place.

Tar oozes out of the ground in Carpinteria California.   It's usually a good sign when it just runs out of the ground, like it did for old Jed Clampett.