fter living around the country, photographer Clint Musgrove and his family moved east of San Francisco in 2002. He fell in love with Northern California landscapes, and after taking a break from photography for years, the area’s beauty inspired him to start retaking photographs in 2014. On an April night in 2018, Musgrove ventured to Schooner Gulch State Park in Mendocino County to capture a rare geological phenomenon.
“A friend and I rode up the coast to Bowling Ball Beach to shoot the uniquely aligned concretions during the morning’s low tide,” he says. “We found the location in the total darkness of a clear, moonless night and saw the bowling balls exposed through sunrise.”
These spherical rocks—called concretions—are best observed at low tide when uncovered by water. The phenomenon occurs when mineral cements bind grains of sand or stone into larger formations that erode over millions of years.