• G. J. Lensen N. Z. Geological Survey, Lower Hutt, New Zealand
  • R. P. Suggate N. Z. Geological Survey, Lower Hutt, New Zealand


Inangahua lies at the northern end of the 60-mile-long Grey-Inangahua Depression, a complex structural feature between predominantly-granite ranges to the east and west. It contains up to 10,000ft of Tertiary and conformably overlying Lower Quaternary sediments, but, because of a general southerly plunge, the preserved thickness diminishes rapidly northwards from 10 miles south of Inangahua, In summary, the sediments consist of basal coal measures, siltstone grading up to limestone, followed by muddy sandstone, further coal measures and thick gravel. The Late Quaternary succession of glacials and interglacials has left a suite of gravel terraces in the valleys.


LENSEN, G. J. 1958: Rationalised Fault Interpretation. N. Z. Jl. Geol. Geophys. 1: 307 - 17

LENSEN, G. J. 1968: Suggestions for Monitoring Deformation on the Wellington Fault and in the Wellington Region, (with discussion on Earthquake Reduction). N. Z. Geol. Surv. Report 28.

SUGGATE, R. P. 1957: The Geology of the Reefton Subdivision. N.Z.Geol. Surv. Bull. n. s. 56.

SUGGATE, R. P. 1965: Late Pleistocene Geology of the Northern Part of the South Island, New Zealand. N.Z. Geol. Surv. Bull. n. s. 77.

How to Cite
Lensen, G. J., & Suggate, R. P. (1969). Geology. Bulletin of the New Zealand Society for Earthquake Engineering, 2(1), 19-23.