 A theory has been put forth that the finale phase of the structure was constructed of stone and concrete and is visible in the topmost layer directly beneath the contemporary ground level next to the remains of the original Rostra before it was moved by Julius Caesar.Due in part to confusion over a similarly named structure nearby and the Roman use of many Greek traditions the location has been debated; however contemporary writings from the time do distinguish two separate structures of which the Graecostadium is one, but much larger and a complete architectural building.Its use was for training and exercise and is the ancient equivalent to a large, complicated gymnasium.