Since Late Miocene, thrusting occurred in the Sicilian orogen and Calabrian accretionary wedge. This section is composed of orthogonal magmatic accretionary segments linked by oblique amagmatic accretionary segments. The Philippine Mobile Belt is composed of a large number of accretionary blocks and terranes. These island arcs may be added to a continental margin during an accretionary orogeny. The orogen is of the accretionary or 'Turkic' type. Notice that both accretionary and collisional orogens developed in converging plate margins. Reverse faulting scrapes off ocean sediment and leads to the formation of an accretionary wedge. The continued faulting of the accretionary wedge leads to overall thickening of the wedge. The accreted material is often referred to as an accretionary wedge, or prism. Fore-arc&colon; This region comprises the trench, the accretionary prism, and the fore-arc basin. Accumulations of wet, spherical ash known as accretionary lapilli are another common surge indicator. In contrast, all trenches with growing accretionary prisms are shallower than . The town of Arcata is built on top of an accretionary wedge.