In the southeastern corner of Otago lies The Catlins, an area of rough hill country which geologically forms part of the Murihiku terrane, an accretion which extends inland through the Hokonui Hills in the Southland region. This itself forms part of a larger system known as the Southland Syncline, which links to similar formations in Nelson (offset by the Alpine Fault) and even in New Caledonia, away. The Catlins ranges are strike ridges composed of Triassic and Jurassic sandstones, mudstones and other related sedimentary rocks, often with a high incidence of feldspar. Fossils of the late and middle Triassic Warepan and Kaihikuan stages are found in the area.