Abstract
The name underthrust slide is given to a type of mass movement characterised by a series of under- thrust shear surfaces in coeval buried soils, subparallel transverse ridges, a marked bulging toe and overlapping erosional and depositional zones. These mass movement features have formed in red weathered greywacke and tephric deposits on relatively gentle hillslopes in several areas of the North Island of New Zealand. The mechan- ics of slope failure have not been thoroughly investi- gated but progressive (downslope) failure would appear to be important. The presence of several coeval but superposed soils suggests that interpretation of paleosols or prior groundsurfaces may prove fallacious in areas where underthrust slides have been identified.
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