Abstract
The discovery last summer (1923) that the "Laurentian" complex, between the Huronian area and the Bancroft-Haliburton area, contains Huronian sediments metamorphosed into rocks of Grenville type, and that with these paragneisses there are amphibolites due to the metamorphism of Keweenawan diabase, indicates that the Grenville rocks of Southeast Ontario should be correlated with the Huronian sediments, and that the batholiths which intrude the Grenville schists and gneisses are post-Huronian in age rather than pre-Huronian and should be mapped as of Keweenawan age rather than Laurentian.
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