Quaternary geology of the Timmins area, northeastern Ontario

This study improved understanding of the stratigraphy in the Timmins area through surficial mapping and analysis of the Timmins overburden drillhole database. Clarification of the complex stratigraphy will aid in mineral exploration through drift prospecting and define the lateral and vertical extent of marker units.;Older units predating the last glaciation occur in low-lying bedrock topography comprising metavolcanic rocks. Ice flow indicators conform to the established chronology of glacial events. The glaciolacustrine sediments of Lake Ojibway were found underlying and overlying Cochrane Till. The last glacial event deposited Cochrane Till as a lodgement diamicton. Varve chronology shows that the sediments overlying Cochrane Till are contemporaneous with the upper sequence of the Barlow-Ojibway Formation south of the Cochrane limit. Strandlines and wave-cut benches formed on Cochrane Till, providing minor refinements of Lake Ojibway water planes and defining more precisely the ages of the Cochrane surge and the draining of Lake Ojibway.