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II.—The Structure and Later Geological History of New Zealand
Published online by Cambridge University Press: 01 May 2009
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As is well known, the skeleton or oldermass of New Zealand is largely composed of a mass of deformed sedimentary rocks, the precise ages of the members of which are in doubt but do not affect the problem under consideration. The most profound deformation of this vast sedimentary group took place in late Jurassic or early Cretaceous times during what may be termed the “Mesozoic orogenic period”, when probably a great mountain range came into existence.
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page 243 note 2 The writer employs the convenient terms ‘oldermass’ and ‘covering strata’ or simply ‘cover’ in the sense in which similar terms were introduced by W. M. Davis (“Relation of Geography to Geology,” Bull. Geol. Soc. Am., vol. xxiii, pp. 93–124, 1912). ‘Oldermass’ means a mass of rocks, generally of complex structure and of various ages, which have been planed down by erosion and which have been covered, during a later period of submergence, by a series of ‘covering strata’.
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