A new technique for analyzing natural data is used on chemical data from the Dundonald sill. It is shown thereby that, with certain exceptions, the conclusions reached by Naldrett and Mason (1968) regarding the differentiation of the sill could have been expressed with greater certainty. The natural chemical data may be used as an independant check on rival hypothetical differentiation processes. The use of conventional graphical techniques has resulted in critical information remaining unused in tables of chemical analyses.

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