Before action is taken by the city council on the application, the council may move to take under consideration the application for a period not to exceed ninety (90) days from the date of public hearing. After consideration, the city council shall approve the application as submitted and recommended by the planning commission, or deny the application, or return the application to the city planning commission for further study. If approved there shall be required an ordinance which shall describe the district amendment and cause the official zoning map to be amended. (1986 Code)