The Old River field is located approximately 8 miles southwest of Bakersfield, 1¼ miles south of the East Gosford field, and 3 miles east of the Ten Section field. The field was discovered in December, 1953, and all productions to date has been developed in the upper part of the Stevens sand.

Accumulation is attributed to lenticularity of upper Stevens sand members both laterally and updip on a broad, south-plunging nose developed in late Pliocene time. None of the field wells has penetrated the entire Stevens section, but an abandoned well one mile south of the field encountered a thickness of 1,750 feet, predominantly sand with minor shale interbeds.

The section is similar to that of the East Gosford and Bellevue fields, with upper Miocene-lower Pliocene shales grading eastward to a predominantly sand section. The Stevens sand is therefore largely isolated from the East-side Chanac-Santa Margarita series by a shale barrier.

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