Concludes that the major constituents of magmatically related Caledonian plutonic and hypabyssal rocks of western Scotland commenced to crystallize in the following order: olivine (when present), rhombic pyroxene, plagioclase and augite or hornblende, biotite, quartz, potash feldspar. Discussion by Donald C. McIntyre presents several criticisms of conclusions and suggests that the Scottish Caledonian plutonic rocks may be of metasomatic rather than magmatic origin.

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