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wholly from either or both of these- 

 craters. In addition there is a re- 

 entrant curve in the contours to the 

 east of the point where the Bay Road 

 approaches Blue Lake. There is also 

 a less well-marked re-entrant curve 

 in the same contours to the west of 

 the Hospital. 



Beyond the data of elevations 

 and curve of contour lines, there is. 

 no evidence as to the locus of the 

 third crater that must have existed' 

 hereabouts. On plotting the inform- 

 ation available, one is reluctantly 

 compelled to relinquish the attrac- 

 tive theory that the Valley Lake 

 was the site of a crater, and to- 

 assume that a third and smaller 

 crater existed in the small and deep 

 depression now known as the Leg of 

 Mutton Lake. 



(d) Section through the Re- 

 constructed Cones, showing Collapses,, 

 etc. — To test the truth or otherwise 

 of the reconstruction, numerous true- 

 sections were drawn, and checked 

 against the known facts of slope, dip,, 

 etc. The most informative of these 

 sections is shown in fig. 8. 



In this section (fig. 8), the 

 known facts of structure detailed in 

 previous paragraphs are embodied. 

 The section is drawn from the point 

 A, fig. 7, through the Tower Point 

 to the centre of the "Mount Gam- 

 bier crater," thence to the centre of 

 the "Leg of Mutton crater," thence 

 to the centre of the "Blue Lake 

 crater," and thence through the 

 highest point on the rim of the Blue 

 Lake (the Look-out). 



It would appear from the sec- 

 tion that the ash deposits on the 

 flanks of the Leg of Mutton (central) 

 Lake might have been deposited from 

 the eastern and western craters, but 

 the section does not show the high 



