ABSTRACT
This paper treats of the location and economic importance of the field. The formations described are of Miocene and Pliocene age. The Wheeler Ridge anticline is an asymmetric fold, the north flank having the steeper dips. The structure is closed, the highest part of the structure being in the present developed area. There is a large fault south of the anticline which is not considered to be of the low angle, thrust type, but nearly vertical. Oil is recovered from sands in the Maricopa shale as well as from the Etchegoin formation.
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