Question: The Parshall Oil Field is an oil field producing from a rock unit from the Late Devonian to Early Mississippian age occupying about how many sqmi?
Sentence (from "Bakken Formation"): The Bakken Formation is a rock unit from the Late Devonian to Early Mississippian age occupying about 200000 sqmi of the subsurface of the Williston Basin, underlying parts of Montana, North Dakota, Saskatchewan and Manitoba.
Relevant evidence: Yes