Discoveries of the past century have presented archaeologists with an assemblage of artifacts and remains that shed light on the peninsula's history and its inhabitants.
In an area just outside Olympic National Park, remains of a mastodon with a spear-point embedded in its ribs provide clues to the earliest prehistoric occupation. It was likely that the earliest prehistoric period, between 12,000 to 6,000 years before present (B.P.), inhabitants of the peninsula hunted large land animals as a means of subsistence. The following several thousand years are marked as one of major adaptive change as the exploitation of salmon and flatfish became the major means of subsistence.