62 pkesident's address — section c. 



the Maitai rocks, the " Brook Street Igneous rocks." They 

 have been thrust on tc' overturned Tertiary rocks, but though 

 sometimes gromped with Te Anau rocks they may be Triassic. 

 (Seei Fig. 1). Other more or less metamorphosed volcanic rocks 

 occur sometimes associated with unfossiliferous " Maitai " slates, 

 as, for example, the variolitic "diabase tuff" near Wellington 

 (Broadgate 1916) and the diabase tuffs of the Rimutaka ranges 

 further to the north, though possibly these should be grouped 

 'li'ith the Upper Triassic volcanic rocks. These are assocaated 

 with ferruginous jaspilites and argillites, and recall the features 

 of palseo'zoic submarine flows (though nolt pillow-lavas) 



Fig. 1. Suggested Section from Dun Mountain to Nelson, alternative to that given by 

 the Geological Survey 13ull. 12. 



1. Permian (Maitai) greywacke and limestone. 2. Upper Triassic (Noric) or 

 Permian basic volcanicrocks. 3. Upper Triassic sediments. 4. Peridotite. 

 5. Miocene marine beds overlying coal-measures. 



observed by the writer in Europe* and Australia, in which 

 there has been much change due to hydrothermal action pro- 

 ducing layers of red rock. Examples of these are rather widely 

 disturbed. With them we may also class the epidotised variolite 

 of Mt. St. Mary in south-west Canterbui-y, the basic pyroclastic 

 rocks west of Lake Wakatipu, &c. There is, however, a possi- 

 bility that so>me of these southern rocks also may belong to' the 

 Upper Triassic series of flows, which we shall consider later. 



In the Wellington district the red rocks are interbedded with 

 normal steeply dipping greywackes and argillites in which are 

 found fragments of annelid-tubes. In a rather calcareous 

 layer Thomson has found cbscure foraminifera*. Gotten and the 

 writer found also near Wellington an amphicoelous vertebra. 



In the Nelson district, the original locality for the Maitai rocks, 

 Treehmann has obtained the following forms: — " Aphanaia " .s^.f 

 (the form erroneously compared with Inoceramus), Platyschisma, 

 Mmirloirui^ Sfrnph(ilo»i(i, Mfirfin/op.n.'i, Spirife?-a hisiilcata, a form 



* Private communioation. 



t N.B. — Since the above was written Mr. W. S. Dun, Government Palaeontoloffist for New 

 South Wales, has stated to the writer that this form for several reasonn (notably the possession 

 of a large posterior ear, and marked ligamental structures) cannot be referred to De Koninck's 

 genus Aphntinia. 



