"From the conventional standpoint (vertical wells) the wells drilled into the Tyler sandstones are better producers than most of the vertical wells drilled into the Bakken/Three Forks," Nordeng said. "This is because the Tyler contains reservoir rocks (sandstones) that allow economic oil production from vertical wells whereas the Bakken/Three Forks wells (outside the Antelope Field) do not. However, the new horizontal Bakken/Three Forks wells are much better producers, at least initially, than the old vertical Tyler wells
So North dakota is turning up large area and thin oil formations at many levels. Besides the Bakken there is also the Spearfish oil formation (also called the Waskada).
The Three forks formation probably adds 2 billion barrels to the Bakken
The Bakken has massive amounts of oil in place.
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Ocean Floor Gold and Copper
Ocean Floor Mining Company