Our midweek adventure — a scheduled event of the Irvine Ranch Natural Landmarks conservancy — took us four and a half hours to finish, counting the short breaks at The Sinks and Box Spring. The trail began at a notorious local dead end. We followed the water lines up Agua Chinon (“wavy water”) Canyon with no real trouble until we hit a steep loma as hellish as the south slope of Whiting’s Dreaded Hill. The summit brought us face to face with the western section of The Sinks
An inland sea or lake deposited the layers that appear in The Sinks formation about 40 million years ago. A long period of wet weather — sometime in the last million years — super-saturated the hills and caused the looser soil to slide away. The badland that was left exposed layers of harder red and white sediments that draw hikers and bikers to special “open days” at the Limestone Canyon Wilderness Park.