364 



Main Boring. — Diagram showing Proportion of Calcium and Magnesium Carljonate at different Depths. 



Depth CALCIUM ^^ 

 in feeb. ^^^ ^^ ^ 



CARBONATE. 



Ffercentage of 



•Number M^eXrDepth MAGNESIUM >^.Vv>;>-;V:V::v: CARBONATE.^ )^i^ntSm 

 of Cons. CdTDOnate. infeefc. i - . - . - . • . ■■ .- ■ ■ . i of Core. Caraonate. 



Ffercentage of 



(^) 



4-23 



il2>) 



7-62 



(15) 



16-4 



(20) 



11-99 



(26) 



160 



(34) 



11-59 



(44) 



91 



(55) 



5-85 



(60) 



3-20 



(66) 



5-6 



(83) 



51 



(93) 



4-9 





6-8 



(110) 



2-11 



(U4) 



4-6 



(120) 



4-4 



(128) 



3-7 



(135) 



4-3 



(137) 



3-9 



(141) 



115 



(W1) 



1-19 



(150) 



1-1 



(153) 



•79 



(175) 



2-7 



(176) 



4-0 



(186) 



1-01 





2-9 





49 





4-9 





4-6 





4-7 



(196) 



1-15 



(198) 1-15 



Fig. 23, A. 



Fig. 2.3, li. 



