Rum, Eigg, Muck, Canna, and Sanday make up the Small Isles of Inverness-shire, southwest of Skye, Scotland, United Kingdom. Nineteenth-century geologist-cum-naturalists recognized that Rum contained the roots of a central volcano that had infiltrated Precambrian and Jurassic rocks. Alfred Harker defined “allivalite” and “harrisite” rock types in the layered ultrabasic rocks. Various technical geological descriptions for Rum and elsewhere were updated or revised by E. B. Bailey and J. E. Richey, leading finally to the full-blown treatment of layered igneous rocks by geologists, including the mountaineer L. R. Wager and his students G. M. Brown, W. J. Wadsworth, C. H....
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