The Polledrara field , identified in 1984, is one of the richest paleontological sites there are . The site is by the Sabatino volcanic hills, 20 km NW from Rome, 83 m above the sea-level. A 900 square metre  roof, covers and preserves a great section of the site. Inside the museum it is possible to visit the archaeological excavation through a foot-bridge, and it is possible to see both the former river bed and the swamp area where many faunal evidences still are. The river bed section is 35-40 m wide  and 1,5 m deep . In the swamp area there was an intense human and animal presence, pointed out by the discovery of many fossil remains, ascribable in a great part to the ancient Elephant and the primitive Ox. It  is possible to see the skeleton of an elephant that got trapped in the mud, with  a wolf skull inside its ribs, that probably died  in the same way trying to eat the carcass. Together with the faunal  evidences more than 500 lithic objects were also collected, such as  flint pebbles and siliceous limestone, carried there by man.