University of Alaska Fairbanks officials say researchers have discovered ancient artifacts in northwest Alaska.

The discovery of several decorated clay discs was made this summer while archaeologists excavated at the site of previously discovered petroglyphs and three prehistoric dwellings at Noatak National Preserve.

Officials say the excavation team included researchers from UAF's Museum of the North and the National Park Service.

The team assembled at the site discovered almost 40 years ago to document the rock art and to excavate partially underground house pits.

Museum of the North archaeologist Scott Shirar says in a news release the discs appear to be a unique artifact for Alaska. He says the excavation covered only a small area and the discovery indicates there are probably more artifacts.