
The Simi Valley basin serves as a central hub for ranching, energy extraction, and transit in this 1951 study, later updated with suburban growth patterns in 1969. The northern foothills of the Santa Susana Mountains and Big Mountain are heavily defined by petroleum development, including the Oakridge Oil Field, Tapo Ridge Oil Field, and South Tapo Canyon Oil Field. While large holdings like Tapo Ranch and Marr Ranch occupy the canyons, the valley floor shows the early urban footprint of Santa Susana.
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