. Transactions . from Scotland, a naval officerwho had a liking for geology, was chosen by Logan as his chiefassistant. When the Survey was commenced in 1843 that of theState of New York already made some progress and as thesame rock formations extend from that State into Canada, Loganwisely adopted the formational names of the New York geologistsin order to secure as much uniformity as possible. One of his greatest services to geology was his early investiga-tion of the ancient crystalline rocks,his separation of the Huronianfrom the Laurentian, to which he gave those names, and his work
. Transactions . from Scotland, a naval officerwho had a liking for geology, was chosen by Logan as his chiefassistant. When the Survey was commenced in 1843 that of theState of New York already made some progress and as thesame rock formations extend from that State into Canada, Loganwisely adopted the formational names of the New York geologistsin order to secure as much uniformity as possible. One of his greatest services to geology was his early investiga-tion of the ancient crystalline rocks,his separation of the Huronianfrom the Laurentian, to which he gave those names, and his work-ing out of some areas of the Laurentian in the Ottawa Valley aswell as his cooperating with Murray in defining the Huronian inthe Lakes Superior and Huron regions. 344 The Canadian Mining SIR WILLIAM LOGAN Sir William Logan and the Geological Survey 345 While Murray worked principally in Upper Canada, Loganstime was mostly devoted to the rocks of the Lower province southof the St, LawTence. In connection with this work, the subject ofmetamorphism played an important part, but in these field in-vestigations Logan had not the advantages he might have derivedfrom the microscopic study of rocks if he had lived a generationlater. But even without this most important help he did a mar-vellous amount of good work in classifying the rocks and in ac-curately mapping in great detail their structure and distributionover the large area which comprises the Eastern Townships. Among his discoveries in the comse of this work was that ofthe great fault or dislocation which runs up the valley of theHudson river, passing through the Eastern Townships and downthe course of the lower St. Lawrence river. At the time the Geological Survey was begun, only a feweconomic minerals were know^n to
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