San Luis Obispo, CA -- Hundreds of firefighters are battling flames to contain the wildfire that’s scorched over 5,000 acres close to the San Luis Obispo/Kern County line. No one has been hurt, but a 19th century Kern County cattle branding camp was destroyed. As of last night, the blaze was 90% contained, and it is expected to be fully contained this evening. About 900 of the nearly 5200 acres burned are in San Luis Obispo County. About 600 firefighters from as far away as Sacramento and San Diego were on the fire lines. The blaze started at 10:15 Sunday morning in the McDonald-Anticline Oil Field and flames quickly moved west into San Luis Obispo County's Temblor Range, some 20 miles southwest of Lost Hills. The cause of the fire hasn't been determined.