Logan described as the Grenville series a highly metamorphosed sedimentary series in the vicinity of Grenville, Quebec. His associates and geologists of a later generation mapped similar formations in adjoining areas and extended the distribution of rocks with Grenville series characteristics into southeastern Ontario and the Adirondack Mountains.

These areas are surrounded by somewhat similar sediments, tentatively correlated with the Grenville series. They range from the Mendon series east of the Adiron-dacks, through the Bruce series northwest of the Haliburton-Bancroft area, to sediments in northern Quebec associated with volcanics considered to be a part of the Keewatin, Original evidence for these diversified correlations is analyzed, recent data collected in other work are applied to the correlation problem, and the Grenville series is tentatively dated as pre-volcanic in age.

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