Field, B.D. 1985 Mid Tertiary unconformities in the Mount Somers to Rangitata River area, Canterbury. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report SL 10 17 p.
Abstract: Several unconformities occur in the Oligocene to Miocene limestone, greensand and sandstone units between the Rakaia and Rangitata Rivers. Erosion occured in the mid to late Whaingaroan, Duntroonian, Duntroonian to Waitakian and Otaian to Altonian