• BUFFALO, S.D. (AP) -- South Dakota has the four famed faces of Mount Rushmore, a few more pheasants than North Dakota and the world's only corn palace.
• But when it comes to crude oil, its neighbor to the north is king.
• The Dakotas have been locked in geographic sibling rivalry since 1889, when they were split from a single territory and became states on the same day. The divide has intensified in past decade with North Dakota's unprecedented oil boom that has propelled it to the nation's No.2 oil producer behind Texas.
• "Sure, there is some jealousy," said Derric Iles, South Dakota's state geologist. "We want a piece of the economic pie North Dakota has, plain and simple."
• Despite speculation, widespread hope and some worry that North Dakota's oil rush may balloon across the border, experts say it's doubtful South Dakota will experience anything remotely close.
• Case in point: South Dakota has produced about 1.6 million barrels of oil annually for the past four years, an official with the Department of Environment and Natural Resources said. North Dakota pumps that amount in just more than two days.
• On Thursday, North Dakota had 210 rigs drilling. South Dakota had a single rig piercing the prairie.
• Geology is the difference. The rich Bakken shale formation, where oil-producing rock is sandwiched between layers of shale nearly two miles underground in western North Dakota, is not present in South Dakota.
• The Three Forks formation below the Bakken in North Dakota does reach into South Dakota, but has gone largely unexplored. Geologists and oil companies are split over whether it's a separate oil-producing reservoir or if it simply catches oil

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