Abstract

The Gowganda Formation is a world-famous example of a glacial deposit. It was interpreted as continental in origin in the north and marine in the south. However, drill cores from near the northern limit of the outcrop consist entirely of resedimented glacial diamictites, ice-rifted deposits, and pelagic marine-shelf sediment. No true tills are present in these cores or in outcrop near Elliot Lake. The conglomerates are debris flows, and the sandstones include liquefied/fluidized and grain-flow deposits and thin-bedded turbidities. These sediments show crude upward-fining cyclicity or grading and probably were deposited on submarine outwash fans. The presence of marine deposits so far north and the absence of true tills calls for a reappraisal of Gowganda sedimentology by means of modern sedimentological basin-analysis techniques. A depositional model based on an ice shelf is proposed.--Modified journal abstract.

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