It shall be the duty of such boundary commission to cause a joint survey to be made of such boundary line according to the description thereof in the statutes and to have such line plainly marked by suitable monuments set at convenient intervals and to cause a plat and field notes of such survey to be filed in the office of the county clerk of each of said counties. Such plat and field notes shall be signed and certified by the members of the boundary commission as the official plat and field notes of said boundary line as located by the commission.