The Wolf Springs field, 7 N.-32., Yellowstone

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County, Montana, produces 30° gravity oil from the Amsden dolomite at an average depth of 6,200 feet. Discovery was made by the Atlantic Refining Company in August, 1955.

Prior published comment considers the oil pool to be an accumulation due to hydrodynamic tilt to the northeast of the axis of the Wolf Springs anticline, as contoured on top of the Amsden formation. Wells drilled during 1959 add regional information which casts doubt on the hydrodynamic thesis. An interpretation is offered whereby the oil pool localization is shown as being due entirely to stratigraphic factors.

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