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Relations to the Older Formations.

There is no doubt that great unconformity exists between this and the Waihao formation, of which clear proofs are to be found near Burke's Pass and the Waihao country. In the Southern Alps proper, the boundaries between the two formations are not so clearly defined, in most instances no break being visible. In such cases, it is impossible to define the boundary line between them, the facies of the rocks being the only guide. Amongst the localities where this unconformity is to be observed, one occurs near the head of the Stewart, one of the source branches of the Rakaia, another twelve miles up the River Hopkins, and again on the slopes of Mount Brewster, but generally in ascending the rivers, we cross from one formation into the other, without observing any difference in the strike and dip of the strata.