MANAGEMENT PLAN

Landform and Geology

Prior to the formation of the gorge the area was part of an extensive peneplain extending from Makara to Khandallah. The present landform developed from earthquake and erosion activity resulting in the formation of the gorge. A characteristic feature of the peneplain remnant is the rounded forms of the higher slopes contrasting quite dramatically with the steeper erosion-formed valley sides.

While the landforms within the park appear to be typically those of a valley landscape in reality the landforms are considerabl y more complex and varied. Within the park there are a series of quite dramatic bluffs, spurs, steep rock faces and outcrops along with a series of ravine -like side valleys. Some of the more visually striking landforms and rock outcrops are above and on the south side of the Kaiwharawhara Stream on l and which is not currently within the park. However, visually these areas are seen as an integral part of the park landscape. Generally the landforms in the Kaiwharawhara Stream valley are more dramatic and visually striking than those in the Korimako S tream valley.

Geologically the area consists of variably weathered, fractured and jointed sandstones and argillites. Bedrock slopes are carved by thin colluvium and solifluction deposits.

The soils are yellow-brown Ngaio, Korokoro and Makara hill soils, and Ngaio silt loam over greywacke. The soils are reasonably fertile and very well drained.