On June 6, 1953, a commemorative plaque was dedicated beside the CSO No. 4 oil well in Pico Canyon by Standard Oil of California and the Petroleum Production Pioneers, honoring the well’s pivotal role in California’s petroleum history. The plaque reads: “First Commercial Oil Well in California On this site stands CSO-4 (Pico #4), California’s ... The post Today in SCV History: June 6, 1953 – Petroleum Production Pioneers Dedicate Plaque at Pico No. 4 appeared first on KHTS Radio. ...read more read less