Two summit platforms lie on the ridge. The eastern one is the larger of these platforms and the western oval-shaped platform lies close to the western end of the ridge. These platforms are relatively flat and are surrounded by a slope break beyond which the guyot falls off steeply to the surrounding abyssal plain. This appearance characterises Horizon Guyot as a guyot although the elongated shape is unlike that of most guyots in the region which have one circular summit platform. At the margin of the platform, lie terraces which are up to wide and up to high and that discontinuously surround the summit platform; the flat surfaces of the terraces may be former fringing reefs. On the eastern summit platform there are buried terraces beneath the sediment cover.