Above us rises Diablo Peak, the highest point in the Channel Islands, towering more than 740 meters over the sea. Gill halts the Land Cruiser and leads us up across a steep slope. For years now, archaeologists have known that the island-dwelling Chumash had access to plenty of seafood and birds along the shoreline. “There is lots of protein and fats here,” says Erlandson, as we walk across the dry soil baking in the August sun. “But where are the carbs?”