132 



E. 0. Teale 



"basic lavas and tuffs, the latter often admixed in part with fine 

 normal sediment. Ilie nature of the deposits, while not suggesting 

 specially deep-water conditions, would favour tlie view that they 

 accumulated over a sea. floor at some distance from a shore line. 

 The cherts and tuffs are of a uniform and fine nature, possessing 

 none of the special features expected in those deposited under lit- 



Upper 'Cambrian Sta 



Vl'tLLINSTOM 



U° 4 



Lower Devonian Land hrt?^ ^nd Terrestrial Volcanoes 



N" 6. 



Lower Carboniftroos 

 Lacuitnne &<asini 



G laqram of Successive Palaeozoic Basins 



toral conditions. The advent of OrdoTician, times does not appear 

 to have been marked by any break in deposition, but the sediments, 

 still of a fine uniform nature, tecame more normal, for submarine 

 volcanic activity had c(mie to an eird. The distribution of land 

 and water remained much the same, and the succession on the whole, 

 therefore, is probably a conformable one, but local gaps in the 

 record appear to occur, notably in the Wellington area, where 

 Upper Cambrian is in contact with Upper Ordovician. Elsewhere 

 — as at Lancefield and Heathcote — it is impossible to determine 

 closely where Cambrian ends and Ordovician begins. 



