Santarosae as a steppingstone in their migration down the Pacific Coast, arguing convincingly that humans in boats moved from northeastern Asia into the Americas along what he called “the kelp highway,” hunting and fishing in coastal kelp beds as they went. A host of finds on the four northern Channel Islands confirms his theory. For example, a skeleton found on Santa Rosa, just west of Santa Cruz, dates back 13,000 years, making it one of the oldest human remains ever dated in North America.