Local residents who enjoy the relative wildness and beauty of Roxborough State Park near Denver, Colo., are fighting a developer's plans to build 850 houses along the park's entire eastern boundary. The development, known as Southdowns at Roxborough, could begin as soon as this March and would destroy wildlife habitat for deer, elk and golden eagles, according to the Friends of Roxborough State Park. The 1,620-acre park is listed as a Colorado natural area, a national natural landmark and as a cultural district on the National Register of Historic Places for its archaeological evidence of ancient nomadic encampments. The citizens' group believes a buffer zone is needed around the park to protect wildlife and archaeological sites, as well as the geology of the area, which is similar to the Garden of the Gods near Colorado Springs. The group has created a fund to buy out the Southdowns area and has raised over $150,000 toward its $1 million goal. For more information, call Sally Gardner, the group's public contact, at 303/972-1362, or write Friends of Roxborough State Park, 2000 E. County Line Rd. C-111, Highlands Ranch, CO 80126.