MARBLEMOUNT, Wash. — Until Seattle City Light built a company-town dining hall a century ago, until the building was renovated a decade ago and until they were dug up during that renovation, the 270 stone artifacts likely sat undisturbed for millennia upon millennia. The objects, found on the shores of the Skagit River, represent the remains of an ancient village of the Upper Skagit Indian Tribe. When Seattle built three dams on the Skagit River in the early 20th century to provide the city with electricity, the city also built a company town for its workers. The town, Newhalem, was built on t…