sentences:  The form of a geison (particularly the Hawksbeak molding of the outer edge) is often used as one element of the argument for the chronology of its building.The horizontal "geison" runs around the full perimeter of a Greek temple, projecting from the top of the entablature to protect it from the elements and as a decorative feature.Horizontal "geisa" may be found in other ancient structures that are built according to one of the architectural orders.