Abstract

The series of slates and graywackes exposed over a large area southwest of Duluth show much deformation. As a result diagrammatic structures are common and show the relation between structures unusually well. The use and limitations of minor structures in determining the major structure of a region are demonstrated.The significance of structure in the correlation of the formation is unusually important. As a result of structural studies supported by other data, it is concluded that the formation is not Animikie but is older than the unconformity at the base of the Animikie, that is the formation is pre-Algoman.

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