Abstract
Approximately 18,000 feet of sediments, divisible into six members, and 27,000 feet of volcanics below and above these sediments make up the early pre-Cambrian geologic column in the Savant Lake area. These rocks have been folded, intensely faulted, and subjected to at least one period of granitic intrusion and two periods of basic dike intrusion. In the sediments, and especially in the lavas, primary structures were found to be of great value in working out the structure. Correlation was attempted only with the Sioux Lookout and Sturgeon Lake areas. The genesis of the two iron-bearing members is considered. Microscopic evidence suggests the possibility of formation through selective replacement by hydrothermal solutions. Other evidence points to a syngenetic origin.
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