Reservation Plan (Continued) developments and to management of the environment by the native population. About 3,000 years ago the valley became cooler and molster, but these changes seem not to have radically altered the existing environment of the valley. Perhaps this was because the occupants of the valley were able to maintain the open nature of the country by periodic burning of forest cover. The cultures continued relatively unchanged, in so far as artifacts are concerned, for the next thousand years. In this period the first remains of pit houses are found. From about 2,000 years ago, there is increasing evidence of contact with people In surrounding regions. Sea shells, shell ornaments, and whale bone clubs indicate contact with coastal people, although these items may have been traded via the Columbia River, rather than over the Coast Range. There is also evidence of contact with Great Basin people and with people south to California. Obsidian for tools was obtained from locations as far distant as eastern Idaho. By the end of the prehistoric period, it is clear that although the Willamette Valley people were fairly self-sufficient in an environment with varied and abundant resources, they nevertheless had extensive trade contacts in every direction. The cultures of the Willamette Valley did not change dramatically over the last few thousand years of prehistory. The people lived primarily by hunting and making use of uncultivated plants in an environment which was characterized by a mild climate and rich flora and fauna. Deer, elk, and other game were abundant. Social and political organization in the valley remained simple, as it was at the time of European contact. All the evidence suggests that the Willamette Valley people had achieved a remarkably stable equilibrium with their environment. At the time of contact, these people spoke dialects of Kalapuyan, Molalla, and Clackamas Chinook languages. The ancestors of these people may very well have been the first settlers in the valley. The prehistory of the Salish-speaking Nehalem, Tillamook, Nestucca, and Salmon River people of the Oregon coast, some of whom were eventually relocated on the Grand Ronde Reservation, is distinct from that of the Willamette Valley peoples just discussed. By 2,500 years ago, Sallsh speakers were settled Just south of the mouth of the Columbia with a fully developed Northwest Coast fishing culture similar to that of their kin on the Washington Coast and in the Puget Sound region. We do not know whether people were living along the coast much before the past few thousand years. If there were sites occupied in earlier times, presumably they have disappeared with rising sea levels along the stormy Oregon coast.