On this site stands CSO-4 (Pico #4), California's first commerically productive well. It was spudded in early 1876, under the direction of Demetrius G. Scofield, later to become first president of Standard Oil Company of California, and was completed at a d…
We are building the largest online collection of historical markers, along with other markers that
represent significant events, people, places, and more, but we can't do it without your help. Become
a member and you'll be able to add historical markers, post comments, save favorites, check in, and
Subscribe To Our Newsletter
Keep up with everything we do — We'll deliver our newsletter to your inbox each week.