4 entries match your criteria. Related Historical MarkersTo better understand the relationship, study each marker in the order shown. By Craig Baker, January 30, 2018 Remains of Well, and Markers SHOWN IN SOURCE-SPECIFIED ORDER1► California (Los Angeles County), Stevenson Ranch — 516 — First Commercial Oil Well In California — Pico #4 — 2► California (Los Angeles County), Stevenson Ranch — 516-2 — Mentryville — 3► California (Los Angeles County), Newhall — 172 — Pioneer Oil Refinery — ← 3 Miles — 4► California (Los Angeles County), Newhall — 172 — Pioneer Oil Refinery —