PLACER COUNTY, Calif. – A site in Martis Valley is up for consideration and may soon find its way on the National Register of Historic Places. Martis Valley is unique in that it cradles a blend of both Sierra Nevada and Great Basin habitats and ecosystems, with meadows, forests and brushlands. The blend of habitats makes it rich in plants, animals, and birds, offering an immersive bike ride or walk via the Martis Valley Trail. But before bicycli…